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GL3: Optimize shadow rendering

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now DrawAliasShadow() only uses one draw call per model, pretty much
like DrawAliasFrameLerp()
This commit is contained in:
Daniel Gibson 2017-05-02 03:07:31 +02:00
parent b45a6d8ef9
commit 9751caac85
1 changed files with 59 additions and 9 deletions
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68
src/client/refresh/gl3/gl3_mesh.c
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@ -335,10 +335,16 @@ DrawAliasShadow(dmdl_t *paliashdr, int posenum)
// GL1 uses alpha 0.5, but in GL3 0.3 looks better
GLfloat color[4] = {0, 0, 0, 0.3};
STUB_ONCE("TODO: Draw Stencil Shadows in one drawcall, like models!");
// draw the shadow in a single draw call, just like the model
da_clear(vtxBuf);
da_clear(idxBuf);
while (1)
{
int i, j;
GLushort nextVtxIdx = da_count(vtxBuf);
/* get the vertex count and primitive type */
count = *order++;
@ -358,9 +364,9 @@ DrawAliasShadow(dmdl_t *paliashdr, int posenum)
type = GL_TRIANGLE_STRIP;
}
gl3_alias_vtx_t vtx[count];
gl3_alias_vtx_t* buf = da_addn_uninit(vtxBuf, count);
for(int i=0; i<count; ++i)
for(i=0; i<count; ++i)
{
/* normals and vertexes come from the frame list */
VectorCopy(s_lerped[order[2]], point);
@ -369,19 +375,63 @@ DrawAliasShadow(dmdl_t *paliashdr, int posenum)
point[1] -= shadevector[1] * (point[2] + lheight);
point[2] = height;
VectorCopy(point, vtx[i].pos);
VectorCopy(point, buf[i].pos);
for(int j=0; j<4; ++j) vtx[i].color[j] = color[j];
for(j=0; j<4; ++j) buf[i].color[j] = color[j];
order += 3;
}
GL3_BindVAO(gl3state.vaoAlias);
GL3_BindVBO(gl3state.vboAlias);
glBufferData(GL_ARRAY_BUFFER, count*sizeof(gl3_alias_vtx_t), vtx, GL_STREAM_DRAW);
glDrawArrays(type, 0, count);
// translate triangle fan/strip to just triangle indices
if(type == GL_TRIANGLE_FAN)
{
GLushort i;
for(i=1; i < count-1; ++i)
{
GLushort* add = da_addn_uninit(idxBuf, 3);
add[0] = nextVtxIdx;
add[1] = nextVtxIdx+i;
add[2] = nextVtxIdx+i+1;
}
}
else // triangle strip
{
GLushort i;
for(i=1; i < count-2; i+=2)
{
// add two triangles at once, because the vertex order is different
// for odd vs even triangles
GLushort* add = da_addn_uninit(idxBuf, 6);
add[0] = nextVtxIdx + i-1;
add[1] = nextVtxIdx + i;
add[2] = nextVtxIdx + i+1;
add[3] = nextVtxIdx + i;
add[4] = nextVtxIdx + i+2;
add[5] = nextVtxIdx + i+1;
}
// add remaining triangle, if any
if(i < count-1)
{
GLushort* add = da_addn_uninit(idxBuf, 3);
add[0] = nextVtxIdx + i-1;
add[1] = nextVtxIdx + i;
add[2] = nextVtxIdx + i+1;
}
}
}
GL3_BindVAO(gl3state.vaoAlias);
GL3_BindVBO(gl3state.vboAlias);
glBufferData(GL_ARRAY_BUFFER, da_count(vtxBuf)*sizeof(gl3_alias_vtx_t), vtxBuf.p, GL_STREAM_DRAW);
GL3_BindEBO(gl3state.eboAlias);
glBufferData(GL_ELEMENT_ARRAY_BUFFER, da_count(idxBuf)*sizeof(GLushort), idxBuf.p, GL_STREAM_DRAW);
glDrawElements(GL_TRIANGLES, da_count(idxBuf), GL_UNSIGNED_SHORT, NULL);
if (have_stencil)
{
glDisable(GL_STENCIL_TEST);