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opengles2: Attempt to batch RenderCopy calls into a single glDrawArrays call.

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This commit is contained in:
Ryan C. Gordon 2021-09-19 00:39:28 -04:00
parent 1f0eb03a76
commit 08797adaef
1 changed files with 71 additions and 5 deletions
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76
src/render/opengles2/SDL_render_gles2.c
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@ -788,7 +788,7 @@ GLES2_QueueCopy(SDL_Renderer * renderer, SDL_RenderCommand *cmd, SDL_Texture * t
int color;
GLfloat minx, miny, maxx, maxy;
GLfloat minu, maxu, minv, maxv;
const size_t vertlen = 4 * (2 * sizeof (float) + sizeof (int) + 2 * sizeof (float));
const size_t vertlen = 6 * (2 * sizeof (float) + sizeof (int) + 2 * sizeof (float));
GLfloat *verts = (GLfloat *) SDL_AllocateRenderVertices(renderer, vertlen, 0, &cmd->data.draw.first);
if (!verts) {
@ -813,12 +813,29 @@ GLES2_QueueCopy(SDL_Renderer * renderer, SDL_RenderCommand *cmd, SDL_Texture * t
minv = (GLfloat) srcrect->y / texture->h;
maxv = (GLfloat) (srcrect->y + srcrect->h) / texture->h;
/* set these up as GL_TRIANGLES instead of GL_TRIANGLE_STRIP; it's more
vertices, but we can then draw unconnected pieces in a single draw
call if there are several draws in a row using the same texture
(such as a particle system or texture atlas). */
*(verts++) = minx;
*(verts++) = miny;
*((int *)verts++) = color;
*(verts++) = minu;
*(verts++) = minv;
*(verts++) = maxx;
*(verts++) = miny;
*((int *)verts++) = color;
*(verts++) = maxu;
*(verts++) = minv;
*(verts++) = minx;
*(verts++) = maxy;
*((int *)verts++) = color;
*(verts++) = minu;
*(verts++) = maxv;
*(verts++) = maxx;
*(verts++) = miny;
*((int *)verts++) = color;
@ -855,7 +872,7 @@ GLES2_QueueCopyEx(SDL_Renderer * renderer, SDL_RenderCommand *cmd, SDL_Texture *
const GLfloat centery = center->y + dstrect->y;
GLfloat minx, miny, maxx, maxy;
GLfloat minu, maxu, minv, maxv;
const size_t vertlen = 4 * (2 * sizeof (float) + sizeof (int) + (2 + 2 + 2) * sizeof (float));
const size_t vertlen = 6 * (2 * sizeof (float) + sizeof (int) + (2 + 2 + 2) * sizeof (float));
GLfloat *verts = (GLfloat *) SDL_AllocateRenderVertices(renderer, vertlen, 0, &cmd->data.draw.first);
if (!verts) {
@ -889,9 +906,13 @@ GLES2_QueueCopyEx(SDL_Renderer * renderer, SDL_RenderCommand *cmd, SDL_Texture *
minv = ((GLfloat) srcquad->y) / ((GLfloat) texture->h);
maxv = ((GLfloat) (srcquad->y + srcquad->h)) / ((GLfloat) texture->h);
cmd->data.draw.count = 1;
/* set these up as GL_TRIANGLES instead of GL_TRIANGLE_STRIP; it's more
vertices, but we can then draw unconnected pieces in a single draw
call if there are several draws in a row using the same texture
(such as a particle system or texture atlas). */
*(verts++) = minx;
*(verts++) = miny;
*((int *)verts++) = color;
@ -922,6 +943,26 @@ GLES2_QueueCopyEx(SDL_Renderer * renderer, SDL_RenderCommand *cmd, SDL_Texture *
*(verts++) = centerx;
*(verts++) = centery;
*(verts++) = maxx;
*(verts++) = miny;
*((int *)verts++) = color;
*(verts++) = maxu;
*(verts++) = minv;
*(verts++) = s;
*(verts++) = c;
*(verts++) = centerx;
*(verts++) = centery;
*(verts++) = minx;
*(verts++) = maxy;
*((int *)verts++) = color;
*(verts++) = minu;
*(verts++) = maxv;
*(verts++) = s;
*(verts++) = c;
*(verts++) = centerx;
*(verts++) = centery;
*(verts++) = maxx;
*(verts++) = maxy;
*((int *)verts++) = color;
@ -1375,9 +1416,34 @@ GLES2_RunCommandQueue(SDL_Renderer * renderer, SDL_RenderCommand *cmd, void *ver
case SDL_RENDERCMD_COPY:
case SDL_RENDERCMD_COPY_EX: {
if (SetCopyState(renderer, cmd) == 0) {
data->glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
/* as long as we have the same copy command in a row, with the
same texture, we can combine them all into a single draw call. */
SDL_Texture *thistexture = cmd->data.draw.texture;
const SDL_RenderCommandType thiscmdtype = cmd->command;
SDL_RenderCommand *finalcmd = cmd;
SDL_RenderCommand *nextcmd = cmd->next;
int quads = 1;
while (nextcmd != NULL) {
const SDL_RenderCommandType nextcmdtype = nextcmd->command;
if (nextcmdtype != thiscmdtype) {
/* SETDRAWCOLOR commands are safe because copy color is set in the vbo per-vertex. */
if ((nextcmdtype != SDL_RENDERCMD_SETDRAWCOLOR) && (nextcmdtype != SDL_RENDERCMD_NO_OP)) {
break; /* can't go any further on this draw call, different render command up next. */
}
} else if (nextcmd->data.draw.texture != thistexture) {
break; /* can't go any further on this draw call, different texture copy up next. */
} else {
finalcmd = nextcmd; /* we can combine copy operations here. Mark this one as the furthest okay command. */
quads++;
}
nextcmd = nextcmd->next;
}
if (SetCopyState(renderer, cmd) == 0) {
data->glDrawArrays(GL_TRIANGLES, 0, quads * 6);
}
cmd = finalcmd; /* skip any copy commands we just combined in here. */
break;
}