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OpenGL: Fix GL1 overlay drawing

This commit is contained in:
Vicki Pfau 2023-04-30 00:50:02 -07:00
parent 2e5751ef6f
commit 90420586e6
1 changed files with 29 additions and 19 deletions
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48
src/platform/opengl/gl.c
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@ -145,13 +145,33 @@ static void _setFrame(struct mRectangle* dims, struct mRectangle* frame) {
GLint viewport[4];
glGetIntegerv(GL_VIEWPORT, viewport);
glScissor(viewport[0] + (dims->x - frame->x) * viewport[2] / frame->width,
viewport[1] + (dims->y - frame->y) * viewport[3] / frame->height,
viewport[1] + (frame->height + frame->y - dims->height - dims->y) * viewport[3] / frame->height,
dims->width * viewport[2] / frame->width,
dims->height * viewport[3] / frame->height);
glLoadIdentity();
glTranslatef(dims->x, dims->y, 0);
glScalef(toPow2(dims->width), toPow2(dims->height), 1);
}
static void _drawLayers(struct mGLContext* context, int start, int end) {
struct mRectangle frame;
VideoBackendGetFrame(&context->d, &frame);
int layer;
for (layer = start; layer < end; ++layer) {
if (context->layerDims[layer].width < 1 || context->layerDims[layer].height < 1) {
continue;
}
glEnable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
glBindTexture(GL_TEXTURE_2D, context->layers[layer]);
_setFilter(&context->d);
_setFrame(&context->layerDims[layer], &frame);
glDrawArrays(GL_TRIANGLE_FAN, 0, 4);
}
}
void mGLContextDrawFrame(struct VideoBackend* v) {
struct mGLContext* context = (struct mGLContext*) v;
glEnable(GL_TEXTURE_2D);
@ -166,36 +186,26 @@ void mGLContextDrawFrame(struct VideoBackend* v) {
VideoBackendGetFrame(v, &frame);
glOrtho(frame.x, frame.x + frame.width, frame.y + frame.height, frame.y, 0, 1);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
int layer;
for (layer = 0; layer < VIDEO_LAYER_IMAGE; ++layer) {
if (context->layerDims[layer].width < 1 || context->layerDims[layer].height < 1) {
continue;
}
glDisable(GL_BLEND);
glBindTexture(GL_TEXTURE_2D, context->layers[layer]);
_setFilter(v);
glPushMatrix();
_setFrame(&context->layerDims[layer], &frame);
glDrawArrays(GL_TRIANGLE_FAN, 0, 4);
glPopMatrix();
}
_drawLayers(context, 0, VIDEO_LAYER_IMAGE);
_setFrame(&context->layerDims[VIDEO_LAYER_IMAGE], &frame);
glDisable(GL_BLEND);
if (v->interframeBlending) {
glBlendFunc(GL_CONSTANT_ALPHA, GL_ONE_MINUS_CONSTANT_ALPHA);
glBlendColor(1, 1, 1, 0.5);
glBindTexture(GL_TEXTURE_2D, context->tex[context->activeTex ^ 1]);
_setFilter(v);
glDrawArrays(GL_TRIANGLE_FAN, 0, 4);
glEnable(GL_BLEND);
glBlendFunc(GL_CONSTANT_ALPHA, GL_ONE_MINUS_CONSTANT_ALPHA);
glBlendColor(1, 1, 1, 0.5);
}
glBindTexture(GL_TEXTURE_2D, context->tex[context->activeTex]);
_setFilter(v);
glDrawArrays(GL_TRIANGLE_FAN, 0, 4);
glDisable(GL_BLEND);
_drawLayers(context, VIDEO_LAYER_IMAGE + 1, VIDEO_LAYER_MAX);
}
static void mGLContextSetImageSize(struct VideoBackend* v, enum VideoLayer layer, int width, int height) {