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metal: CopyEx transform matrix must be aligned for constant buffer access.

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This commit is contained in:
Ryan C. Gordon 2018-10-04 20:21:58 -04:00
parent 638d624f5a
commit 208c4b0361
1 changed files with 23 additions and 17 deletions
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40
src/render/metal/SDL_render_metal.m
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@ -871,14 +871,33 @@ METAL_QueueCopyEx(SDL_Renderer * renderer, SDL_RenderCommand *cmd, SDL_Texture *
const float rads = (float)(M_PI * (float) angle / 180.0f);
const float c = cosf(rads), s = sinf(rads);
float minu, maxu, minv, maxv;
// !!! FIXME: use an index buffer
const size_t vertlen = (sizeof (float) * 32);
float *verts = (float *) SDL_AllocateRenderVertices(renderer, vertlen, 0, &cmd->data.draw.first);
float *verts;
// cheat and store this offset in (count) because it needs to be aligned in ways other fields don't and we aren't using count otherwise.
verts = (float *) SDL_AllocateRenderVertices(renderer, vertlen, CONSTANT_ALIGN, &cmd->data.draw.count);
if (!verts) {
return -1;
}
cmd->data.draw.count = 1;
// transform matrix
SDL_memset(verts, '\0', sizeof (*verts) * 16);
verts[10] = verts[15] = 1.0f;
// rotation
verts[0] = c;
verts[1] = s;
verts[4] = -s;
verts[5] = c;
// translation
verts[12] = dstrect->x + center->x;
verts[13] = dstrect->y + center->y;
// rest of the vertices don't need the aggressive alignment. Pack them in.
verts = (float *) SDL_AllocateRenderVertices(renderer, vertlen, 0, &cmd->data.draw.first);
if (!verts) {
return -1;
}
minu = normtex(srcquad->x, texw);
maxu = normtex(srcquad->x + srcquad->w, texw);
@ -916,19 +935,6 @@ METAL_QueueCopyEx(SDL_Renderer * renderer, SDL_RenderCommand *cmd, SDL_Texture *
*(verts++) = maxu;
*(verts++) = minv;
// transform matrix
SDL_memset(verts, '\0', sizeof (*verts) * 16);
verts[10] = verts[15] = 1.0f;
// rotation
verts[0] = c;
verts[1] = s;
verts[4] = -s;
verts[5] = c;
// translation
verts[12] = dstrect->x + center->x;
verts[13] = dstrect->y + center->y;
return 0;
}
@ -1172,7 +1178,7 @@ METAL_RunCommandQueue(SDL_Renderer * renderer, SDL_RenderCommand *cmd, void *ver
case SDL_RENDERCMD_COPY_EX: {
SetCopyState(renderer, cmd, CONSTANTS_OFFSET_INVALID, mtlbufvertex, &statecache);
[data.mtlcmdencoder setVertexBuffer:mtlbufvertex offset:cmd->data.draw.first+(16*sizeof (float)) atIndex:3]; // transform
[data.mtlcmdencoder setVertexBuffer:mtlbufvertex offset:cmd->data.draw.count atIndex:3]; // transform
[data.mtlcmdencoder drawPrimitives:MTLPrimitiveTypeTriangleStrip vertexStart:0 vertexCount:4];
break;
}