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render: Make the GL backends cache and defer more state changes.

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This commit is contained in:
Ryan C. Gordon 2018-10-01 22:53:45 -04:00
parent fcb4681336
commit 0c2e10dce4
3 changed files with 174 additions and 107 deletions
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84
src/render/opengl/SDL_render_gl.c
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@ -62,11 +62,17 @@ struct GL_FBOList
typedef struct
{
SDL_bool viewport_dirty;
SDL_Rect viewport;
SDL_Texture *texture;
SDL_Texture *target;
int drawablew;
int drawableh;
SDL_BlendMode blend;
GL_Shader shader;
SDL_bool cliprect_enabled_dirty;
SDL_bool cliprect_enabled;
SDL_bool cliprect_dirty;
SDL_Rect cliprect;
SDL_bool texturing;
Uint32 color;
@ -934,6 +940,42 @@ SetDrawState(GL_RenderData *data, const SDL_RenderCommand *cmd, const GL_Shader
{
const SDL_BlendMode blend = cmd->data.draw.blend;
if (data->drawstate.viewport_dirty) {
const SDL_bool istarget = data->drawstate.target != NULL;
const SDL_Rect *viewport = &data->drawstate.viewport;
data->glMatrixMode(GL_PROJECTION);
data->glLoadIdentity();
data->glViewport(viewport->x,
istarget ? viewport->y : (data->drawstate.drawableh - viewport->y - viewport->h),
viewport->w, viewport->h);
if (viewport->w && viewport->h) {
data->glOrtho((GLdouble) 0, (GLdouble) viewport->w,
(GLdouble) istarget ? 0 : viewport->h,
(GLdouble) istarget ? viewport->h : 0,
0.0, 1.0);
}
data->glMatrixMode(GL_MODELVIEW);
data->drawstate.viewport_dirty = SDL_FALSE;
}
if (data->drawstate.cliprect_enabled_dirty) {
if (!data->drawstate.cliprect_enabled) {
data->glDisable(GL_SCISSOR_TEST);
} else {
data->glEnable(GL_SCISSOR_TEST);
}
data->drawstate.cliprect_enabled_dirty = SDL_FALSE;
}
if (data->drawstate.cliprect_enabled && data->drawstate.cliprect_dirty) {
const SDL_Rect *viewport = &data->drawstate.viewport;
const SDL_Rect *rect = &data->drawstate.cliprect;
data->glScissor(viewport->x + rect->x,
data->drawstate.target ? viewport->y + rect->y : data->drawstate.drawableh - viewport->y - rect->y - rect->h,
rect->w, rect->h);
data->drawstate.cliprect_dirty = SDL_FALSE;
}
if (blend != data->drawstate.blend) {
if (blend == SDL_BLENDMODE_NONE) {
data->glDisable(GL_BLEND);
@ -1035,18 +1077,18 @@ GL_RunCommandQueue(SDL_Renderer * renderer, SDL_RenderCommand *cmd, void *vertic
{
/* !!! FIXME: it'd be nice to use a vertex buffer instead of immediate mode... */
GL_RenderData *data = (GL_RenderData *) renderer->driverdata;
int drawablew = 0, drawableh = 0;
const SDL_bool istarget = renderer->target != NULL;
size_t i;
if (GL_ActivateRenderer(renderer) < 0) {
return -1;
}
if (!istarget) {
SDL_GL_GetDrawableSize(renderer->window, &drawablew, &drawableh);
data->drawstate.target = renderer->target;
if (!data->drawstate.target) {
SDL_GL_GetDrawableSize(renderer->window, &data->drawstate.drawablew, &data->drawstate.drawableh);
}
while (cmd) {
switch (cmd->command) {
case SDL_RENDERCMD_SETDRAWCOLOR: {
@ -1069,18 +1111,7 @@ GL_RunCommandQueue(SDL_Renderer * renderer, SDL_RenderCommand *cmd, void *vertic
SDL_Rect *viewport = &data->drawstate.viewport;
if (SDL_memcmp(viewport, &cmd->data.viewport.rect, sizeof (SDL_Rect)) != 0) {
SDL_memcpy(viewport, &cmd->data.viewport.rect, sizeof (SDL_Rect));
data->glMatrixMode(GL_PROJECTION);
data->glLoadIdentity();
data->glViewport(viewport->x,
istarget ? viewport->y : (drawableh - viewport->y - viewport->h),
viewport->w, viewport->h);
if (viewport->w && viewport->h) {
data->glOrtho((GLdouble) 0, (GLdouble) viewport->w,
(GLdouble) istarget ? 0 : viewport->h,
(GLdouble) istarget ? viewport->h : 0,
0.0, 1.0);
}
data->glMatrixMode(GL_MODELVIEW);
data->drawstate.viewport_dirty = SDL_TRUE;
}
break;
}
@ -1089,18 +1120,11 @@ GL_RunCommandQueue(SDL_Renderer * renderer, SDL_RenderCommand *cmd, void *vertic
const SDL_Rect *rect = &cmd->data.cliprect.rect;
if (data->drawstate.cliprect_enabled != cmd->data.cliprect.enabled) {
data->drawstate.cliprect_enabled = cmd->data.cliprect.enabled;
if (!data->drawstate.cliprect_enabled) {
data->glDisable(GL_SCISSOR_TEST);
} else {
const SDL_Rect *viewport = &data->drawstate.viewport;
data->glEnable(GL_SCISSOR_TEST);
if (SDL_memcmp(&data->drawstate.cliprect, rect, sizeof (SDL_Rect)) != 0) {
data->glScissor(viewport->x + rect->x,
istarget ? viewport->y + rect->y : drawableh - viewport->y - rect->y - rect->h,
rect->w, rect->h);
SDL_memcpy(&data->drawstate.cliprect, rect, sizeof (SDL_Rect));
}
}
data->drawstate.cliprect_enabled_dirty = SDL_TRUE;
}
if (SDL_memcmp(&data->drawstate.cliprect, rect, sizeof (SDL_Rect)) != 0) {
SDL_memcpy(&data->drawstate.cliprect, rect, sizeof (SDL_Rect));
data->drawstate.cliprect_dirty = SDL_TRUE;
}
break;
}
@ -1122,13 +1146,11 @@ GL_RunCommandQueue(SDL_Renderer * renderer, SDL_RenderCommand *cmd, void *vertic
if (data->drawstate.cliprect_enabled) {
data->glDisable(GL_SCISSOR_TEST);
data->drawstate.cliprect_enabled_dirty = SDL_TRUE;
}
data->glClear(GL_COLOR_BUFFER_BIT);
if (data->drawstate.cliprect_enabled) {
data->glEnable(GL_SCISSOR_TEST);
}
break;
}