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Issue 45 #47

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Issue 45 #47

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7618e2e
Set the best GL version that is present, or fall back to 3.1.
verpeteren Jan 10, 2017
c329c4d
Iterating through a list of approved GL versions, starting from the b…
verpeteren Jan 11, 2017
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27 changes: 23 additions & 4 deletions src/Interface/UIInterface.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -47,16 +47,35 @@ UIInterface::UIInterface()

void UIInterface::setGLContextAttribute()
{
struct gl_version {
int major;
int minor;
};
struct gl_version approved_versions[] = {
{4, 5 }, {4, 4}, {4, 3}, {4, 2}, {4, 1}, {4, 0},
{3, 2}, {3, 1}, /*{3, 0},*/
{2, 1}, {2, 0},
{1, 5}, {1, 4}, {1, 3}, {1, 2}, {1, 1},
{-1, -1}
};
struct gl_version * ver;

SDL_GL_SetAttribute(SDL_GL_RED_SIZE, 5);
SDL_GL_SetAttribute(SDL_GL_GREEN_SIZE, 5);
SDL_GL_SetAttribute(SDL_GL_BLUE_SIZE, 5);
SDL_GL_SetAttribute(SDL_GL_STENCIL_SIZE, 0);
SDL_GL_SetAttribute(SDL_GL_BUFFER_SIZE, 32);
SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1);
SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, SDL_GL_CONTEXT_PROFILE_CORE);

SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, SDL_GL_CONTEXT_PROFILE_CORE);
SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 3);
SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 1);
ver = &approved_versions[0];
while (ver->major != -1 ) {
if ( SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, ver->major) == 0 &&
SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, ver->minor) == 0) {
break;
}
}
//printf("Set GL to %d.%d\n", ver->major, ver->minor);
}

bool UIInterface::createWindow(int width, int height)
Expand Down Expand Up @@ -489,7 +508,7 @@ uint8_t *UIInterface::readScreenPixel()
/* Flip Y pixels (row by row) */
for (uint32_t i = 0; i < height; i++) {
memcpy(m_FrameBuffer + i * width * 4,
&ret[(height - i - 1) * width * 4],
&ret[(height - i - 1) * width * 4],
width * 4);
}

Expand Down