163 lines
4.6 KiB
C++
163 lines
4.6 KiB
C++
/*
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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 implied 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) 2020 Blender Foundation.
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* All rights reserved.
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*/
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/** \file
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* \ingroup gpu
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*
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* Encapsulation of Frame-buffer states (attached textures, viewport, scissors).
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*/
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#pragma once
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#include "MEM_guardedalloc.h"
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#include "glew-mx.h"
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#include "gpu_framebuffer_private.hh"
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namespace blender::gpu {
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class GLStateManager;
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/**
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* Implementation of FrameBuffer object using OpenGL.
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*/
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class GLFrameBuffer : public FrameBuffer {
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/* For debugging purpose. */
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friend class GLTexture;
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private:
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/** OpenGL handle. */
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GLuint fbo_id_ = 0;
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/** Context the handle is from. Frame-buffers are not shared across contexts. */
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GLContext *context_ = NULL;
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/** State Manager of the same contexts. */
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GLStateManager *state_manager_ = NULL;
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/** Copy of the GL state. Contains ONLY color attachments enums for slot binding. */
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GLenum gl_attachments_[GPU_FB_MAX_COLOR_ATTACHMENT];
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/** Internal frame-buffers are immutable. */
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bool immutable_;
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/** True is the frame-buffer has its first color target using the GPU_SRGB8_A8 format. */
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bool srgb_;
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/** True is the frame-buffer has been bound using the GL_FRAMEBUFFER_SRGB feature. */
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bool enabled_srgb_ = false;
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public:
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/**
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* Create a conventional frame-buffer to attach texture to.
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*/
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GLFrameBuffer(const char *name);
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/**
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* Special frame-buffer encapsulating internal window frame-buffer.
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* (i.e.: #GL_FRONT_LEFT, #GL_BACK_RIGHT, ...)
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* \param ctx: Context the handle is from.
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* \param target: The internal GL name (i.e: #GL_BACK_LEFT).
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* \param fbo: The (optional) already created object for some implementation. Default is 0.
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* \param w: Buffer width.
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* \param h: Buffer height.
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*/
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GLFrameBuffer(const char *name, GLContext *ctx, GLenum target, GLuint fbo, int w, int h);
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~GLFrameBuffer();
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void bind(bool enabled_srgb) override;
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/**
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* This is a rather slow operation. Don't check in normal cases.
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*/
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bool check(char err_out[256]) override;
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void clear(eGPUFrameBufferBits buffers,
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const float clear_col[4],
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float clear_depth,
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uint clear_stencil) override;
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void clear_multi(const float (*clear_cols)[4]) override;
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void clear_attachment(GPUAttachmentType type,
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eGPUDataFormat data_format,
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const void *clear_value) override;
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void read(eGPUFrameBufferBits planes,
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eGPUDataFormat format,
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const int area[4],
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int channel_len,
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int slot,
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void *r_data) override;
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/**
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* Copy \a src at the give offset inside \a dst.
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*/
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void blit_to(eGPUFrameBufferBits planes,
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int src_slot,
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FrameBuffer *dst,
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int dst_slot,
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int dst_offset_x,
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int dst_offset_y) override;
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void apply_state();
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private:
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void init();
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void update_attachments();
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void update_drawbuffers();
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MEM_CXX_CLASS_ALLOC_FUNCS("GLFrameBuffer");
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};
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/* -------------------------------------------------------------------- */
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/** \name Enums Conversion
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* \{ */
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static inline GLenum to_gl(const GPUAttachmentType type)
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{
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#define ATTACHMENT(X) \
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case GPU_FB_##X: { \
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return GL_##X; \
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} \
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((void)0)
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switch (type) {
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ATTACHMENT(DEPTH_ATTACHMENT);
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ATTACHMENT(DEPTH_STENCIL_ATTACHMENT);
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ATTACHMENT(COLOR_ATTACHMENT0);
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ATTACHMENT(COLOR_ATTACHMENT1);
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ATTACHMENT(COLOR_ATTACHMENT2);
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ATTACHMENT(COLOR_ATTACHMENT3);
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ATTACHMENT(COLOR_ATTACHMENT4);
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ATTACHMENT(COLOR_ATTACHMENT5);
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default:
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BLI_assert(0);
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return GL_COLOR_ATTACHMENT0;
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}
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#undef ATTACHMENT
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}
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static inline GLbitfield to_gl(const eGPUFrameBufferBits bits)
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{
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GLbitfield mask = 0;
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mask |= (bits & GPU_DEPTH_BIT) ? GL_DEPTH_BUFFER_BIT : 0;
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mask |= (bits & GPU_STENCIL_BIT) ? GL_STENCIL_BUFFER_BIT : 0;
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mask |= (bits & GPU_COLOR_BIT) ? GL_COLOR_BUFFER_BIT : 0;
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return mask;
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}
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/** \} */
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} // namespace blender::gpu
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