cairo_status_t
_cairo_gl_composite_begin (cairo_gl_composite_t *setup,
cairo_gl_context_t **ctx_out)
{
cairo_gl_context_t *ctx;
cairo_status_t status;
assert (setup->dst);
status = _cairo_gl_context_acquire (setup->dst->base.device, &ctx);
if (unlikely (status))
return status;
_cairo_gl_context_set_destination (ctx, setup->dst, setup->multisample);
glEnable (GL_BLEND);
status = _cairo_gl_set_operands_and_operator (setup, ctx);
if (unlikely (status))
goto FAIL;
status = _cairo_gl_composite_setup_clipping (setup, ctx, ctx->vertex_size);
if (unlikely (status))
goto FAIL;
*ctx_out = ctx;
FAIL:
if (unlikely (status))
status = _cairo_gl_context_release (ctx, status);
return status;
}
cairo_status_t
_cairo_gl_composite_begin_multisample (cairo_gl_composite_t *setup,
cairo_gl_context_t **ctx_out,
cairo_bool_t multisampling)
{
unsigned int dst_size, src_size, mask_size, vertex_size;
cairo_gl_context_t *ctx;
cairo_status_t status;
cairo_bool_t component_alpha;
cairo_gl_shader_t *shader;
cairo_operator_t op = setup->op;
cairo_surface_t *mask_surface = NULL;
assert (setup->dst);
status = _cairo_gl_context_acquire (setup->dst->base.device, &ctx);
if (unlikely (status))
return status;
_cairo_gl_context_set_destination (ctx, setup->dst, multisampling);
if (ctx->states_cache.blend_enabled == FALSE) {
glEnable (GL_BLEND);
ctx->states_cache.blend_enabled = TRUE;
}
component_alpha =
setup->mask.type == CAIRO_GL_OPERAND_TEXTURE &&
setup->mask.texture.attributes.has_component_alpha;
/* Do various magic for component alpha */
if (component_alpha) {
status = _cairo_gl_composite_begin_component_alpha (ctx, setup);
if (unlikely (status))
goto FAIL;
} else {
if (ctx->pre_shader) {
_cairo_gl_composite_flush (ctx);
ctx->pre_shader = NULL;
}
}
status = _cairo_gl_get_shader_by_type (ctx,
&setup->src,
&setup->mask,
setup->spans,
component_alpha ?
CAIRO_GL_SHADER_IN_CA_SOURCE :
CAIRO_GL_SHADER_IN_NORMAL,
&shader);
if (unlikely (status)) {
ctx->pre_shader = NULL;
goto FAIL;
}
if (ctx->current_shader != shader)
_cairo_gl_composite_flush (ctx);
status = CAIRO_STATUS_SUCCESS;
dst_size = 2 * sizeof (GLfloat);
src_size = _cairo_gl_operand_get_vertex_size (&setup->src);
mask_size = _cairo_gl_operand_get_vertex_size (&setup->mask);
vertex_size = dst_size + src_size + mask_size;
if (setup->spans)
vertex_size += sizeof (GLfloat);
_cairo_gl_composite_setup_vbo (ctx, vertex_size);
_cairo_gl_context_setup_operand (ctx, CAIRO_GL_TEX_SOURCE, &setup->src, vertex_size, dst_size);
_cairo_gl_context_setup_operand (ctx, CAIRO_GL_TEX_MASK, &setup->mask, vertex_size, dst_size + src_size);
if (setup->spans)
_cairo_gl_context_setup_spans (ctx, vertex_size, dst_size + src_size + mask_size);
else {
ctx->dispatch.DisableVertexAttribArray (CAIRO_GL_COVERAGE_ATTRIB_INDEX);
ctx->spans = FALSE;
}
/* XXX: Shoot me - we have converted CLEAR to DEST_OUT,
so the dst_factor would be GL_ONE_MINUS_SRC_ALPHA, if the
mask is a surface and mask content not content_alpha, we want to use
GL_ONE_MINUS_SRC_COLOR, otherwise, we use GL_ONE_MINUS_SRC_ALPHA
*/
if (setup->mask.type == CAIRO_GL_OPERAND_TEXTURE)
mask_surface = &setup->mask.texture.surface->base;
if (op == CAIRO_OPERATOR_CLEAR &&
component_alpha &&
mask_surface != NULL &&
cairo_surface_get_content (mask_surface) == CAIRO_CONTENT_ALPHA)
component_alpha = FALSE;
_cairo_gl_set_operator (ctx, setup->op, component_alpha);
if (_cairo_gl_context_is_flushed (ctx)) {
if (ctx->pre_shader) {
_cairo_gl_set_shader (ctx, ctx->pre_shader);
_cairo_gl_composite_bind_to_shader (ctx, setup);
}
_cairo_gl_set_shader (ctx, shader);
_cairo_gl_composite_bind_to_shader (ctx, setup);
}
status = _cairo_gl_composite_setup_clipping (setup, ctx, vertex_size);
if (unlikely (status))
goto FAIL;
*ctx_out = ctx;
FAIL:
if (unlikely (status))
status = _cairo_gl_context_release (ctx, status);
return status;
}
cairo_status_t
_cairo_gl_composite_begin (cairo_gl_composite_t *setup,
cairo_gl_context_t **ctx_out)
{
unsigned int dst_size, src_size, mask_size, vertex_size;
cairo_gl_context_t *ctx;
cairo_status_t status;
cairo_bool_t component_alpha;
cairo_gl_shader_t *shader;
assert (setup->dst);
status = _cairo_gl_context_acquire (setup->dst->base.device, &ctx);
if (unlikely (status))
return status;
_cairo_gl_context_set_destination (ctx, setup->dst, setup->multisample);
glEnable (GL_BLEND);
component_alpha =
setup->mask.type == CAIRO_GL_OPERAND_TEXTURE &&
setup->mask.texture.attributes.has_component_alpha;
/* Do various magic for component alpha */
if (component_alpha) {
status = _cairo_gl_composite_begin_component_alpha (ctx, setup);
if (unlikely (status))
goto FAIL;
} else {
if (ctx->pre_shader) {
_cairo_gl_composite_flush (ctx);
ctx->pre_shader = NULL;
}
}
status = _cairo_gl_get_shader_by_type (ctx,
&setup->src,
&setup->mask,
setup->spans,
component_alpha ?
CAIRO_GL_SHADER_IN_CA_SOURCE :
CAIRO_GL_SHADER_IN_NORMAL,
&shader);
if (unlikely (status)) {
ctx->pre_shader = NULL;
goto FAIL;
}
if (ctx->current_shader != shader)
_cairo_gl_composite_flush (ctx);
status = CAIRO_STATUS_SUCCESS;
dst_size = 2 * sizeof (GLfloat);
src_size = _cairo_gl_operand_get_vertex_size (setup->src.type);
mask_size = _cairo_gl_operand_get_vertex_size (setup->mask.type);
vertex_size = dst_size + src_size + mask_size;
if (setup->spans)
vertex_size += sizeof (GLfloat);
_cairo_gl_composite_setup_vbo (ctx, vertex_size);
_cairo_gl_context_setup_operand (ctx, CAIRO_GL_TEX_SOURCE, &setup->src, vertex_size, dst_size);
_cairo_gl_context_setup_operand (ctx, CAIRO_GL_TEX_MASK, &setup->mask, vertex_size, dst_size + src_size);
_cairo_gl_context_setup_spans (ctx, setup->spans, vertex_size,
dst_size + src_size + mask_size);
_cairo_gl_set_operator (ctx, setup->op, component_alpha);
if (_cairo_gl_context_is_flushed (ctx)) {
if (ctx->pre_shader) {
_cairo_gl_set_shader (ctx, ctx->pre_shader);
_cairo_gl_composite_bind_to_shader (ctx, setup);
}
_cairo_gl_set_shader (ctx, shader);
_cairo_gl_composite_bind_to_shader (ctx, setup);
}
status = _cairo_gl_composite_setup_clipping (setup, ctx, vertex_size);
if (unlikely (status))
goto FAIL;
*ctx_out = ctx;
FAIL:
if (unlikely (status))
status = _cairo_gl_context_release (ctx, status);
return status;
}
