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draw 3D cursor with new immediate mode

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Replace legacy OpenGL with Gawain. Use shaders instead of fixed
function pipeline.

This simple UI element is shown at startup so is easy to verify things
are working. It also serves as a good example for people converting
other parts of the code.

Part of T49043
This commit is contained in:
Mike Erwin
2016-08-08 15:45:18 -04:00
parent c73e4e99a5
commit 39259fc8ab
1 changed files with 37 additions and 18 deletions
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55
source/blender/editors/space_view3d/view3d_draw.c
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@@ -100,6 +100,8 @@
#include "GPU_material.h"
#include "GPU_compositing.h"
#include "GPU_extensions.h"
#include "GPU_shader.h"
#include "GPU_immediate.h"
#include "view3d_intern.h" /* own include */
@@ -552,39 +554,56 @@ static void drawcursor(Scene *scene, ARegion *ar, View3D *v3d)
const float f20 = U.widget_unit;
glLineWidth(1);
glShadeModel(GL_FLAT);
glBegin(GL_LINE_LOOP);
clear_VertexFormat(&immVertexFormat);
unsigned color = add_attrib(&immVertexFormat, "color", GL_UNSIGNED_BYTE, 3, NORMALIZE_INT_TO_FLOAT);
unsigned pos = add_attrib(&immVertexFormat, "pos", GL_FLOAT, 2, KEEP_FLOAT);
pack(&immVertexFormat);
immBindBuiltinProgram(GPU_SHADER_2D_FLAT_COLOR);
const int segments = 16;
immBegin(GL_LINE_LOOP, segments);
for (int i = 0; i < segments; ++i) {
float angle = 2 * M_PI * ((float)i / (float)segments);
float x = co[0] + f10 * cosf(angle);
float y = co[1] + f10 * sinf(angle);
if (i % 2 == 0)
glColor3ub(255,0,0);
immAttrib3ub(color, 255, 0, 0);
else
glColor3ub(255,255,255);
immAttrib3ub(color, 255, 255, 255);
glVertex2f(x,y);
immVertex2f(pos, x, y);
}
glEnd();
immEnd();
UI_ThemeColor(TH_VIEW_OVERLAY);
immUnbindProgram();
glBegin(GL_LINES);
glVertex2f(co[0] - f20, co[1]);
glVertex2f(co[0] - f5, co[1]);
glVertex2f(co[0] + f5, co[1]);
glVertex2f(co[0] + f20, co[1]);
glVertex2f(co[0], co[1] - f20);
glVertex2f(co[0], co[1] - f5);
glVertex2f(co[0], co[1] + f5);
glVertex2f(co[0], co[1] + f20);
glEnd();
clear_VertexFormat(&immVertexFormat);
pos = add_attrib(&immVertexFormat, "pos", GL_FLOAT, 2, KEEP_FLOAT);
pack(&immVertexFormat);
glShadeModel(GL_SMOOTH);
immBindBuiltinProgram(GPU_SHADER_2D_UNIFORM_COLOR);
float crosshair_color[3];
UI_GetThemeColor3fv(TH_VIEW_OVERLAY, crosshair_color);
immUniform4f("color", crosshair_color[0], crosshair_color[1], crosshair_color[2], 1.0f);
immBegin(GL_LINES, 8);
immVertex2f(pos, co[0] - f20, co[1]);
immVertex2f(pos, co[0] - f5, co[1]);
immVertex2f(pos, co[0] + f5, co[1]);
immVertex2f(pos, co[0] + f20, co[1]);
immVertex2f(pos, co[0], co[1] - f20);
immVertex2f(pos, co[0], co[1] - f5);
immVertex2f(pos, co[0], co[1] + f5);
immVertex2f(pos, co[0], co[1] + f20);
immEnd();
immUnbindProgram();
}
}