702 lines
15 KiB
C
702 lines
15 KiB
C
/*
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* ***** BEGIN GPL LICENSE BLOCK *****
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the ipmlied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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* The Original Code is Copyright (C) 2012 Blender Foundation.
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* All rights reserved.
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*
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* The Original Code is: all of this file.
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*
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* Contributor(s): Alexandr Kuznetsov, Jason Wilkins, Mike Erwin
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*
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* ***** END GPL LICENSE BLOCK *****
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*/
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/** \file source/blender/gpu/intern/gpu_matrix.c
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* \ingroup gpu
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*/
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#include "GPU_matrix.h"
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#include "BLI_math_matrix.h"
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#include "BLI_math_rotation.h"
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#include "BLI_math_vector.h"
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#define DEBUG_MATRIX_BIND 0
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#define MATRIX_STACK_DEPTH 32
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typedef float Mat4[4][4];
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typedef float Mat3[3][3];
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typedef struct {
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Mat4 ModelViewStack3D[MATRIX_STACK_DEPTH];
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Mat4 ProjectionMatrix3D;
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Mat3 ModelViewStack2D[MATRIX_STACK_DEPTH];
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Mat3 ProjectionMatrix2D;
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MatrixMode mode;
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unsigned top; /* of current stack (would have to replicate if gpuResume2D/3D are implemented) */
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bool dirty;
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/* TODO: cache of derived matrices (Normal, MVP, inverse MVP, etc)
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* generate as needed for shaders, invalidate when original matrices change
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*
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* TODO: separate Model from View transform? Batches/objects have model,
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* camera/eye has view & projection
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*/
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} MatrixState;
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static MatrixState state; /* TODO(merwin): make part of GPUContext, alongside immediate mode & state tracker */
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#define ModelView3D state.ModelViewStack3D[state.top]
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#define ModelView2D state.ModelViewStack2D[state.top]
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#define Projection3D state.ProjectionMatrix3D
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#define Projection2D state.ProjectionMatrix2D
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void gpuMatrixInit()
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{
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memset(&state, 0, sizeof(MatrixState));
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}
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void gpuMatrixBegin2D()
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{
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state.mode = MATRIX_MODE_2D;
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state.top = 0;
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unit_m3(ModelView2D);
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gpuOrtho2D(-1.0f, +1.0f, -1.0f, +1.0f); // or identity?
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}
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void gpuMatrixBegin3D()
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{
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state.mode = MATRIX_MODE_3D;
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state.top = 0;
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unit_m4(ModelView3D);
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gpuOrtho(-1.0f, +1.0f, -1.0f, +1.0f, -1.0f, +1.0f); // or identity?
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}
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#if SUPPORT_LEGACY_MATRIX
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void gpuMatrixBegin3D_legacy()
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{
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/* copy top matrix from each legacy stack into new fresh stack */
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state.mode = MATRIX_MODE_3D;
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state.top = 0;
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state.dirty = true;
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glGetFloatv(GL_MODELVIEW_MATRIX, (float*)ModelView3D);
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glGetFloatv(GL_PROJECTION_MATRIX, (float*)Projection3D);
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}
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#endif
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void gpuMatrixEnd()
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{
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state.mode = MATRIX_MODE_INACTIVE;
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}
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#ifdef WITH_GPU_SAFETY
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/* Check if matrix is numerically good */
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static void checkmat(cosnt float *m)
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{
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const int n = state.mode == MATRIX_MODE_3D ? 16 : 9;
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for (int i = 0; i < n; i++) {
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#if _MSC_VER
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BLI_assert(_finite(m[i]));
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#else
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BLI_assert(!isinf(m[i]));
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#endif
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}
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}
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#define CHECKMAT(m) checkmat((const float*)m)
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#else
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#define CHECKMAT(m)
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#endif
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void gpuPushMatrix()
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{
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BLI_assert(state.mode != MATRIX_MODE_INACTIVE);
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BLI_assert(state.top < MATRIX_STACK_DEPTH);
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state.top++;
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if (state.mode == MATRIX_MODE_3D)
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copy_m4_m4(ModelView3D, state.ModelViewStack3D[state.top - 1]);
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else
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copy_m3_m3(ModelView2D, state.ModelViewStack2D[state.top - 1]);
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}
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void gpuPopMatrix()
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{
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BLI_assert(state.mode != MATRIX_MODE_INACTIVE);
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BLI_assert(state.top > 0);
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state.top--;
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state.dirty = true;
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}
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void gpuLoadMatrix3D(const float m[4][4])
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{
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BLI_assert(state.mode == MATRIX_MODE_3D);
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copy_m4_m4(ModelView3D, m);
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CHECKMAT(ModelView3D);
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state.dirty = true;
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}
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void gpuLoadMatrix2D(const float m[3][3])
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{
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BLI_assert(state.mode == MATRIX_MODE_2D);
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copy_m3_m3(ModelView2D, m);
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CHECKMAT(ModelView2D);
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state.dirty = true;
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}
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void gpuLoadIdentity()
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{
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switch (state.mode) {
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case MATRIX_MODE_3D:
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unit_m4(ModelView3D);
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break;
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case MATRIX_MODE_2D:
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unit_m3(ModelView2D);
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break;
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default:
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BLI_assert(false);
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}
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state.dirty = true;
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}
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void gpuTranslate2f(float x, float y)
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{
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Mat3 m;
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unit_m3(m);
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m[2][0] = x;
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m[2][1] = y;
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gpuMultMatrix2D(m);
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}
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void gpuTranslate2fv(const float vec[2])
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{
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gpuTranslate2f(vec[0], vec[1]);
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}
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void gpuTranslate3f(float x, float y, float z)
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{
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BLI_assert(state.mode == MATRIX_MODE_3D);
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#if 1
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translate_m4(ModelView3D, x, y, z);
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CHECKMAT(ModelView3D);
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#else /* above works well in early testing, below is generic version */
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Mat4 m;
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unit_m4(m);
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m[3][0] = x;
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m[3][1] = y;
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m[3][2] = z;
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gpuMultMatrix3D(m);
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#endif
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state.dirty = true;
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}
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void gpuTranslate3fv(const float vec[3])
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{
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gpuTranslate3f(vec[0], vec[1], vec[2]);
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}
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void gpuScaleUniform(float factor)
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{
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switch (state.mode) {
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case MATRIX_MODE_3D:
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{
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Mat4 m;
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scale_m4_fl(m, factor);
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gpuMultMatrix3D(m);
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break;
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}
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case MATRIX_MODE_2D:
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{
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#if 0
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Mat3 m;
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scale_m3_fl(m, factor);
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/* this does 3D scaling in a 3x3 matrix. Can 2D scaling use this safely, or must set m[2][2] = 1.0? */
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#else
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Mat3 m = {{0.0f}};
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m[0][0] = factor;
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m[1][1] = factor;
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m[2][2] = 1.0f;
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#endif
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gpuMultMatrix2D(m);
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break;
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}
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default:
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BLI_assert(false);
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}
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}
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void gpuScale2f(float x, float y)
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{
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Mat3 m = {{0.0f}};
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m[0][0] = x;
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m[1][1] = y;
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m[2][2] = 1.0f;
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gpuMultMatrix2D(m);
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}
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void gpuScale2fv(const float vec[2])
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{
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gpuScale2f(vec[0], vec[1]);
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}
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void gpuScale3f(float x, float y, float z)
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{
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Mat4 m = {{0.0f}};
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m[0][0] = x;
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m[1][1] = y;
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m[2][2] = z;
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m[3][3] = 1.0f;
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gpuMultMatrix3D(m);
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}
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void gpuScale3fv(const float vec[3])
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{
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gpuScale3f(vec[0], vec[1], vec[2]);
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}
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void gpuMultMatrix3D(const float m[4][4])
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{
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BLI_assert(state.mode == MATRIX_MODE_3D);
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mul_m4_m4_pre(ModelView3D, m);
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CHECKMAT(ModelView3D);
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state.dirty = true;
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}
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void gpuMultMatrix2D(const float m[3][3])
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{
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BLI_assert(state.mode == MATRIX_MODE_2D);
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mul_m3_m3_pre(ModelView2D, m);
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CHECKMAT(ModelView2D);
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state.dirty = true;
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}
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void gpuRotate3fv(float deg, const float axis[3])
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{
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Mat4 m;
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axis_angle_to_mat4(m, axis, DEG2RADF(deg));
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gpuMultMatrix3D(m);
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}
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void gpuRotateAxis(float deg, char axis)
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{
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BLI_assert(state.mode == MATRIX_MODE_3D);
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#if 1 /* rotate_m4 works in place, right? */
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rotate_m4(ModelView3D, axis, DEG2RADF(deg));
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CHECKMAT(ModelView3D);
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state.dirty = true;
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#else /* rotate_m4 creates a new matrix */
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Mat4 m;
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rotate_m4(m, axis, DEG2RADF(deg));
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gpuMultMatrix3D(m);
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#endif
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}
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static void mat4_ortho_set(float m[4][4], float left, float right, float bottom, float top, float near, float far)
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{
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m[0][0] = 2.0f / (right - left);
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m[1][0] = 0.0f;
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m[2][0] = 0.0f;
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m[3][0] = -(right + left) / (right - left);
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m[0][1] = 0.0f;
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m[1][1] = 2.0f / (top - bottom);
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m[2][1] = 0.0f;
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m[3][1] = -(top + bottom) / (top - bottom);
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m[0][2] = 0.0f;
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m[1][2] = 0.0f;
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m[2][2] = -2.0f / (far - near);
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m[3][2] = -(far + near) / (far - near);
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m[0][3] = 0.0f;
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m[1][3] = 0.0f;
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m[2][3] = 0.0f;
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m[3][3] = 1.0f;
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state.dirty = true;
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}
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static void mat4_frustum_set(float m[][4], float left, float right, float bottom, float top, float near, float far)
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{
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m[0][0] = 2.0f * near / (right - left);
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m[1][0] = 0.0f;
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m[2][0] = (right + left) / (right - left);
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m[3][0] = 0.0f;
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m[0][1] = 0.0f;
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m[1][1] = 2.0f * near / (top - bottom);
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m[2][1] = (top + bottom) / (top - bottom);
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m[3][1] = 0.0f;
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m[0][2] = 0.0f;
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m[1][2] = 0.0f;
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m[2][2] = -(far + near) / (far - near);
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m[3][2] = -2.0f * far * near / (far - near);
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m[0][3] = 0.0f;
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m[1][3] = 0.0f;
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m[2][3] = -1.0f;
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m[3][3] = 0.0f;
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state.dirty = true;
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}
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static void mat4_look_from_origin(float m[4][4], float lookdir[3], float camup[3])
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{
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/* This function is loosely based on Mesa implementation.
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*
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* SGI FREE SOFTWARE LICENSE B (Version 2.0, Sept. 18, 2008)
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* Copyright (C) 1991-2000 Silicon Graphics, Inc. All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice including the dates of first publication and
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* either this permission notice or a reference to
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* http://oss.sgi.com/projects/FreeB/
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* shall be included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* SILICON GRAPHICS, INC. BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF
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* OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*
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* Except as contained in this notice, the name of Silicon Graphics, Inc.
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* shall not be used in advertising or otherwise to promote the sale, use or
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* other dealings in this Software without prior written authorization from
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* Silicon Graphics, Inc.
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*/
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float side[3];
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normalize_v3(lookdir);
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cross_v3_v3v3(side, lookdir, camup);
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normalize_v3(side);
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cross_v3_v3v3(camup, side, lookdir);
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m[0][0] = side[0];
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m[1][0] = side[1];
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m[2][0] = side[2];
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m[3][0] = 0.0f;
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m[0][1] = camup[0];
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m[1][1] = camup[1];
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m[2][1] = camup[2];
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m[3][1] = 0.0f;
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m[0][2] = -lookdir[0];
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m[1][2] = -lookdir[1];
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m[2][2] = -lookdir[2];
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m[3][2] = 0.0f;
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m[0][3] = 0.0f;
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m[1][3] = 0.0f;
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m[2][3] = 0.0f;
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m[3][3] = 1.0f;
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state.dirty = true;
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}
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void gpuOrtho(float left, float right, float bottom, float top, float near, float far)
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{
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BLI_assert(state.mode == MATRIX_MODE_3D);
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mat4_ortho_set(Projection3D, left, right, bottom, top, near, far);
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CHECKMAT(Projection3D);
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state.dirty = true;
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}
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void gpuOrtho2D(float left, float right, float bottom, float top)
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{
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/* TODO: this function, but correct */
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BLI_assert(state.mode == MATRIX_MODE_2D);
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Mat4 m;
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mat4_ortho_set(m, left, right, bottom, top, -1.0f, 1.0f);
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copy_m3_m4(Projection2D, m);
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CHECKMAT(Projection2D);
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state.dirty = true;
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}
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void gpuFrustum(float left, float right, float bottom, float top, float near, float far)
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{
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BLI_assert(state.mode == MATRIX_MODE_3D);
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mat4_frustum_set(Projection3D, left, right, bottom, top, near, far);
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CHECKMAT(Projection3D);
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state.dirty = true;
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}
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void gpuPerspective(float fovy, float aspect, float near, float far)
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{
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float half_height = tanf(fovy * (float)(M_PI / 360.0)) * near;
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float half_width = half_height * aspect;
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gpuFrustum(-half_width, +half_width, -half_height, +half_height, near, far);
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}
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void gpuLookAt(float eyeX, float eyeY, float eyeZ, float centerX, float centerY, float centerZ, float upX, float upY, float upZ)
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{
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Mat4 cm;
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float lookdir[3];
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float camup[3] = {upX, upY, upZ};
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lookdir[0] = centerX - eyeX;
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lookdir[1] = centerY - eyeY;
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lookdir[2] = centerZ - eyeZ;
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mat4_look_from_origin(cm, lookdir, camup);
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gpuMultMatrix3D(cm);
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gpuTranslate3f(-eyeX, -eyeY, -eyeZ);
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}
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void gpuProject(const float obj[3], const float model[4][4], const float proj[4][4], const GLint view[4], float win[3])
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{
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float v[4];
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mul_v4_m4v3(v, model, obj);
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mul_m4_v4(proj, v);
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win[0] = view[0] + (view[2] * (v[0] + 1)) * 0.5f;
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win[1] = view[1] + (view[3] * (v[1] + 1)) * 0.5f;
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win[2] = (v[2] + 1) * 0.5f;
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}
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bool gpuUnProject(const float win[3], const float model[4][4], const float proj[4][4], const GLint view[4], float obj[3])
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{
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float pm[4][4];
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float in[4];
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float out[4];
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mul_m4_m4m4(pm, proj, model);
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if (!invert_m4(pm)) {
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return false;
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}
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in[0] = win[0];
|
|
in[1] = win[1];
|
|
in[2] = win[2];
|
|
in[3] = 1;
|
|
|
|
/* Map x and y from window coordinates */
|
|
in[0] = (in[0] - view[0]) / view[2];
|
|
in[1] = (in[1] - view[1]) / view[3];
|
|
|
|
/* Map to range -1 to +1 */
|
|
in[0] = 2 * in[0] - 1;
|
|
in[1] = 2 * in[1] - 1;
|
|
in[2] = 2 * in[2] - 1;
|
|
|
|
mul_v4_m4v3(out, pm, in);
|
|
|
|
if (out[3] == 0.0f) {
|
|
return false;
|
|
}
|
|
else {
|
|
out[0] /= out[3];
|
|
out[1] /= out[3];
|
|
out[2] /= out[3];
|
|
|
|
obj[0] = out[0];
|
|
obj[1] = out[1];
|
|
obj[2] = out[2];
|
|
|
|
return true;
|
|
}
|
|
}
|
|
|
|
const float *gpuGetModelViewMatrix3D(float m[4][4])
|
|
{
|
|
#if SUPPORT_LEGACY_MATRIX
|
|
if (state.mode == MATRIX_MODE_INACTIVE) {
|
|
if (m == NULL) {
|
|
static Mat4 temp;
|
|
m = temp;
|
|
}
|
|
|
|
glGetFloatv(GL_MODELVIEW_MATRIX, (float*)m);
|
|
return (const float*)m;
|
|
}
|
|
#endif
|
|
|
|
BLI_assert(state.mode == MATRIX_MODE_3D);
|
|
|
|
if (m) {
|
|
copy_m4_m4(m, ModelView3D);
|
|
return (const float*)m;
|
|
}
|
|
else {
|
|
return (const float*)ModelView3D;
|
|
}
|
|
}
|
|
|
|
const float *gpuGetProjectionMatrix3D(float m[4][4])
|
|
{
|
|
#if SUPPORT_LEGACY_MATRIX
|
|
if (state.mode == MATRIX_MODE_INACTIVE) {
|
|
if (m == NULL) {
|
|
static Mat4 temp;
|
|
m = temp;
|
|
}
|
|
|
|
glGetFloatv(GL_PROJECTION_MATRIX, (float*)m);
|
|
return (const float*)m;
|
|
}
|
|
#endif
|
|
|
|
BLI_assert(state.mode == MATRIX_MODE_3D);
|
|
|
|
if (m) {
|
|
copy_m4_m4(m, ModelView3D);
|
|
return (const float*)m;
|
|
}
|
|
else {
|
|
return (const float*)ModelView3D;
|
|
}
|
|
}
|
|
|
|
const float *gpuGetModelViewProjectionMatrix3D(float m[4][4])
|
|
{
|
|
#if SUPPORT_LEGACY_MATRIX
|
|
if (state.mode == MATRIX_MODE_INACTIVE) {
|
|
if (m == NULL) {
|
|
static Mat4 temp;
|
|
m = temp;
|
|
}
|
|
|
|
Mat4 proj;
|
|
glGetFloatv(GL_MODELVIEW_MATRIX, (float*)proj);
|
|
glGetFloatv(GL_PROJECTION_MATRIX, (float*)m);
|
|
mul_m4_m4_post(m, proj);
|
|
return (const float*)m;
|
|
}
|
|
#endif
|
|
|
|
BLI_assert(state.mode == MATRIX_MODE_3D);
|
|
|
|
if (m == NULL) {
|
|
static Mat4 temp;
|
|
m = temp;
|
|
}
|
|
|
|
mul_m4_m4m4(m, Projection3D, ModelView3D);
|
|
return (const float*)m;
|
|
}
|
|
|
|
const float *gpuGetNormalMatrix(float m[3][3])
|
|
{
|
|
if (m == NULL) {
|
|
static Mat3 temp3;
|
|
m = temp3;
|
|
}
|
|
|
|
copy_m3_m4(m, gpuGetModelViewMatrix3D(NULL));
|
|
|
|
invert_m3(m);
|
|
transpose_m3(m);
|
|
|
|
return (const float*)m;
|
|
}
|
|
|
|
const float *gpuGetNormalMatrixInverse(float m[3][3])
|
|
{
|
|
if (m == NULL) {
|
|
static Mat3 temp3;
|
|
m = temp3;
|
|
}
|
|
|
|
gpuGetNormalMatrix(m);
|
|
invert_m3(m);
|
|
|
|
return (const float*)m;
|
|
}
|
|
|
|
void gpuBindMatrices(GLuint program)
|
|
{
|
|
/* TODO: split this into 2 functions
|
|
* 1) get uniform locations & determine 2D or 3D
|
|
*/
|
|
GLint loc_MV = glGetUniformLocation(program, "ModelViewMatrix");
|
|
GLint loc_P = glGetUniformLocation(program, "ProjectionMatrix");
|
|
GLint loc_MVP = glGetUniformLocation(program, "ModelViewProjectionMatrix");
|
|
GLint loc_N = glGetUniformLocation(program, "NormalMatrix");
|
|
|
|
/* 2) set uniform values to matrix stack values
|
|
* program needs to be bound
|
|
*/
|
|
glUseProgram(program);
|
|
|
|
|
|
/* call this portion before a draw call if desired matrices are dirty */
|
|
if (loc_MV != -1) {
|
|
#if DEBUG_MATRIX_BIND
|
|
puts("setting 3D MV matrix");
|
|
#endif
|
|
|
|
glUniformMatrix4fv(loc_MV, 1, GL_FALSE, gpuGetModelViewMatrix3D(NULL));
|
|
}
|
|
|
|
if (loc_P != -1) {
|
|
#if DEBUG_MATRIX_BIND
|
|
puts("setting 3D P matrix");
|
|
#endif
|
|
|
|
glUniformMatrix4fv(loc_P, 1, GL_FALSE, gpuGetProjectionMatrix3D(NULL));
|
|
}
|
|
|
|
if (loc_MVP != -1) {
|
|
#if DEBUG_MATRIX_BIND
|
|
puts("setting 3D MVP matrix");
|
|
#endif
|
|
|
|
glUniformMatrix4fv(loc_MVP, 1, GL_FALSE, gpuGetModelViewProjectionMatrix3D(NULL));
|
|
}
|
|
|
|
if (loc_N != -1) {
|
|
#if DEBUG_MATRIX_BIND
|
|
puts("setting 3D normal matrix");
|
|
#endif
|
|
|
|
glUniformMatrix3fv(loc_N, 1, GL_FALSE, gpuGetNormalMatrix(NULL));
|
|
}
|
|
|
|
state.dirty = false;
|
|
}
|
|
|
|
bool gpuMatricesDirty()
|
|
{
|
|
return state.dirty;
|
|
}
|