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Fixed bug 1844 - glScissor calls are wrong - Patch attached

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Martin Gerhardy

the coordinate system from sdl is not correctly transformed to the coordinate system of opengl. glScissor expects them to be a little bit different. Attached is a patch that fixes this
This commit is contained in:
Philipp Wiesemann
2013-05-12 13:40:02 +02:00
parent f38eef4c83
commit de43af1b54
3 changed files with 6 additions and 3 deletions
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3
src/render/opengl/SDL_render_gl.c
View File

@@ -794,7 +794,8 @@ GL_UpdateClipRect(SDL_Renderer * renderer)
if (!SDL_RectEmpty(rect)) {
data->glEnable(GL_SCISSOR_TEST);
data->glScissor(rect->x, rect->h - rect->y, rect->w, rect->h);
int lowerLeft = renderer->viewport.h - rect->y - rect->h;
data->glScissor(rect->x, lowerLeft, rect->w, rect->h);
} else {
data->glDisable(GL_SCISSOR_TEST);
}

3
src/render/opengles/SDL_render_gles.c
View File

@@ -645,7 +645,8 @@ GLES_UpdateClipRect(SDL_Renderer * renderer)
if (!SDL_RectEmpty(rect)) {
data->glEnable(GL_SCISSOR_TEST);
data->glScissor(rect->x, rect->h - rect->y, rect->w, rect->h);
int lowerLeft = renderer->viewport.h - rect->y - rect->h;
data->glScissor(rect->x, lowerLeft, rect->w, rect->h);
} else {
data->glDisable(GL_SCISSOR_TEST);
}

3
src/render/opengles2/SDL_render_gles2.c
View File

@@ -288,7 +288,8 @@ GLES2_UpdateClipRect(SDL_Renderer * renderer)
if (!SDL_RectEmpty(rect)) {
rdata->glEnable(GL_SCISSOR_TEST);
rdata->glScissor(rect->x, rect->h - rect->y, rect->w, rect->h);
int lowerLeft = renderer->viewport.h - rect->y - rect->h;
rdata->glScissor(rect->x, lowerLeft, rect->w, rect->h);
} else {
rdata->glDisable(GL_SCISSOR_TEST);
}