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gl: Provide a fast emitter for solid spans

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Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
This commit is contained in:
Chris Wilson 2012-12-30 12:32:45 +00:00
parent d3848521c4
commit c29ab389fb
1 changed files with 50 additions and 5 deletions
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55
src/cairo-gl-composite.c
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@ -910,10 +910,8 @@ _cairo_gl_context_emit_rect (cairo_gl_context_t *ctx,
static void
_cairo_gl_composite_emit_span (cairo_gl_context_t *ctx,
GLfloat x1,
GLfloat y1,
GLfloat x2,
GLfloat y2,
GLfloat x1, GLfloat y1,
GLfloat x2, GLfloat y2,
uint8_t alpha)
{
_cairo_gl_composite_prepare_buffer (ctx, 6,
@ -928,10 +926,57 @@ _cairo_gl_composite_emit_span (cairo_gl_context_t *ctx,
_cairo_gl_composite_emit_alpha_vertex (ctx, x1, y2, alpha);
}
static void
_cairo_gl_composite_emit_solid_span (cairo_gl_context_t *ctx,
GLfloat x1, GLfloat y1,
GLfloat x2, GLfloat y2,
uint8_t alpha)
{
GLfloat *v;
union fi {
float f;
GLbyte bytes[4];
} fi;
_cairo_gl_composite_prepare_buffer (ctx, 6,
CAIRO_GL_PRIMITIVE_TYPE_TRIANGLES);
v = (GLfloat *) (void *) &ctx->vb[ctx->vb_offset];
v[15] = v[ 6] = v[0] = x1;
v[10] = v[ 4] = v[1] = y1;
v[12] = v[ 9] = v[3] = x2;
v[16] = v[13] = v[7] = y2;
fi.bytes[0] = 0;
fi.bytes[1] = 0;
fi.bytes[2] = 0;
fi.bytes[3] = alpha;
v[17] =v[14] = v[11] = v[8] = v[5] = v[2] = fi.f;
ctx->vb_offset += 6*3 * sizeof(GLfloat);
}
cairo_gl_emit_span_t
_cairo_gl_context_choose_emit_span (cairo_gl_context_t *ctx)
{
return _cairo_gl_composite_emit_span;
if (ctx->operands[CAIRO_GL_TEX_MASK].type != CAIRO_GL_OPERAND_NONE)
return _cairo_gl_composite_emit_span;
switch (ctx->operands[CAIRO_GL_TEX_SOURCE].type) {
default:
case CAIRO_GL_OPERAND_COUNT:
ASSERT_NOT_REACHED;
case CAIRO_GL_OPERAND_NONE:
case CAIRO_GL_OPERAND_CONSTANT:
return _cairo_gl_composite_emit_solid_span;
case CAIRO_GL_OPERAND_LINEAR_GRADIENT:
case CAIRO_GL_OPERAND_RADIAL_GRADIENT_A0:
case CAIRO_GL_OPERAND_RADIAL_GRADIENT_NONE:
case CAIRO_GL_OPERAND_RADIAL_GRADIENT_EXT:
case CAIRO_GL_OPERAND_TEXTURE:
return _cairo_gl_composite_emit_span;
}
}
static inline void