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Persistent display for OpenGL

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This commit is contained in:
Simon Robertshaw
2011-10-29 13:46:14 +01:00
parent a2d1ed0bac
commit 52fd083db4
1 changed files with 3 additions and 1 deletions
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4
src/graphics.c
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@@ -358,7 +358,8 @@ void clearScreen(float alpha)
} }
else else
{ {
glColor4f(0.0f, 0.0f, 0.0f, alpha); glBlendEquation(GL_FUNC_REVERSE_SUBTRACT);
glColor4f(1.0f, 1.0f, 1.0f, alpha);
glBindFramebuffer(GL_DRAW_FRAMEBUFFER, partsFbo); glBindFramebuffer(GL_DRAW_FRAMEBUFFER, partsFbo);
glBegin(GL_QUADS); glBegin(GL_QUADS);
glVertex2f(0, 0); glVertex2f(0, 0);
@@ -367,6 +368,7 @@ void clearScreen(float alpha)
glVertex2f(0, YRES); glVertex2f(0, YRES);
glEnd(); glEnd();
glBindFramebuffer(GL_DRAW_FRAMEBUFFER, 0); glBindFramebuffer(GL_DRAW_FRAMEBUFFER, 0);
glBlendEquation(GL_FUNC_ADD);
} }
glClearColor(0.0f, 0.0f, 0.0f, 1.0f); glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
glClear(GL_COLOR_BUFFER_BIT); glClear(GL_COLOR_BUFFER_BIT);