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https://gitlab.freedesktop.org/cairo/cairo.git
synced 2026-06-07 16:58:24 +02:00
[gl] Move the component alpha composite to using GLSL when available.
This commit is contained in:
Eric Anholt
parent
8357336ed7
commit
0fceac4d52
1 changed files with 108 additions and 57 deletions
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@ -1125,9 +1125,29 @@ _cairo_gl_operand_destroy (cairo_gl_composite_operand_t *operand)
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}
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static void
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_cairo_gl_set_tex_combine_constant_color (cairo_gl_context_t *ctx, int tex_unit,
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_cairo_gl_set_tex_combine_constant_color (cairo_gl_context_t *ctx,
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cairo_gl_composite_setup_t *setup,
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int tex_unit,
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GLfloat *color)
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{
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if (setup->shader) {
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const char *uniform_name;
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if (tex_unit == 0)
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uniform_name = "constant_source";
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else
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uniform_name = "constant_mask";
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bind_vec4_to_shader(setup->shader->program,
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uniform_name,
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color[0],
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color[1],
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color[2],
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color[3]);
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return;
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}
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/* Fall back to fixed function */
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glActiveTexture (GL_TEXTURE0 + tex_unit);
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/* Have to have a dummy texture bound in order to use the combiner unit. */
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glBindTexture (GL_TEXTURE_2D, ctx->dummy_tex);
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@ -1169,17 +1189,8 @@ _cairo_gl_set_src_operand (cairo_gl_context_t *ctx,
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switch (setup->src.type) {
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case OPERAND_CONSTANT:
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if (setup->shader) {
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bind_vec4_to_shader(setup->shader->program,
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"constant_source",
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setup->src.operand.constant.color[0],
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setup->src.operand.constant.color[1],
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setup->src.operand.constant.color[2],
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setup->src.operand.constant.color[3]);
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} else {
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_cairo_gl_set_tex_combine_constant_color (ctx, 0,
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setup->src.operand.constant.color);
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}
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_cairo_gl_set_tex_combine_constant_color (ctx, setup, 0,
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setup->src.operand.constant.color);
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break;
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case OPERAND_TEXTURE:
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_cairo_gl_set_texture_surface (0, setup->src.operand.texture.tex,
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@ -1228,24 +1239,23 @@ _cairo_gl_set_src_alpha_operand (cairo_gl_context_t *ctx,
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constant_color[1] = setup->src.operand.constant.color[3];
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constant_color[2] = setup->src.operand.constant.color[3];
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constant_color[3] = setup->src.operand.constant.color[3];
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_cairo_gl_set_tex_combine_constant_color (ctx, 0, constant_color);
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_cairo_gl_set_tex_combine_constant_color (ctx, setup, 0,
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constant_color);
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break;
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case OPERAND_TEXTURE:
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constant_color[0] = 0.0;
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constant_color[1] = 0.0;
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constant_color[2] = 0.0;
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constant_color[3] = 1.0;
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_cairo_gl_set_texture_surface (0, setup->src.operand.texture.tex,
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src_attributes);
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/* Set up the combiner to just set color to the sampled texture. */
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glTexEnvi (GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_COMBINE);
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glTexEnvi (GL_TEXTURE_ENV, GL_COMBINE_RGB, GL_REPLACE);
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glTexEnvi (GL_TEXTURE_ENV, GL_COMBINE_ALPHA, GL_REPLACE);
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if (!setup->shader) {
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/* Set up the combiner to just set color to the sampled texture. */
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glTexEnvi (GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_COMBINE);
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glTexEnvi (GL_TEXTURE_ENV, GL_COMBINE_RGB, GL_REPLACE);
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glTexEnvi (GL_TEXTURE_ENV, GL_COMBINE_ALPHA, GL_REPLACE);
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glTexEnvi (GL_TEXTURE_ENV, GL_SRC0_RGB, GL_TEXTURE0);
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glTexEnvi (GL_TEXTURE_ENV, GL_SRC0_ALPHA, GL_TEXTURE0);
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glTexEnvi (GL_TEXTURE_ENV, GL_OPERAND0_RGB, GL_SRC_ALPHA);
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glTexEnvi (GL_TEXTURE_ENV, GL_OPERAND0_ALPHA, GL_SRC_ALPHA);
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glTexEnvi (GL_TEXTURE_ENV, GL_SRC0_RGB, GL_TEXTURE0);
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glTexEnvi (GL_TEXTURE_ENV, GL_SRC0_ALPHA, GL_TEXTURE0);
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glTexEnvi (GL_TEXTURE_ENV, GL_OPERAND0_RGB, GL_SRC_ALPHA);
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glTexEnvi (GL_TEXTURE_ENV, GL_OPERAND0_ALPHA, GL_SRC_ALPHA);
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}
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break;
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}
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}
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@ -1262,49 +1272,61 @@ _cairo_gl_set_component_alpha_mask_operand (cairo_gl_context_t *ctx,
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mask_attributes = &setup->mask.operand.texture.attributes;
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glActiveTexture (GL_TEXTURE1);
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glEnable (GL_TEXTURE_2D);
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glTexEnvi (GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_COMBINE);
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glTexEnvi (GL_TEXTURE_ENV, GL_COMBINE_RGB, GL_MODULATE);
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glTexEnvi (GL_TEXTURE_ENV, GL_COMBINE_ALPHA, GL_MODULATE);
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if (!setup->shader) {
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glTexEnvi (GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_COMBINE);
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glTexEnvi (GL_TEXTURE_ENV, GL_COMBINE_RGB, GL_MODULATE);
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glTexEnvi (GL_TEXTURE_ENV, GL_COMBINE_ALPHA, GL_MODULATE);
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glTexEnvi (GL_TEXTURE_ENV, GL_SRC1_RGB, GL_PREVIOUS);
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glTexEnvi (GL_TEXTURE_ENV, GL_SRC1_ALPHA, GL_PREVIOUS);
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glTexEnvi (GL_TEXTURE_ENV, GL_OPERAND1_RGB, GL_SRC_COLOR);
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glTexEnvi (GL_TEXTURE_ENV, GL_OPERAND1_ALPHA, GL_SRC_ALPHA);
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glTexEnvi (GL_TEXTURE_ENV, GL_SRC1_RGB, GL_PREVIOUS);
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glTexEnvi (GL_TEXTURE_ENV, GL_SRC1_ALPHA, GL_PREVIOUS);
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glTexEnvi (GL_TEXTURE_ENV, GL_OPERAND1_RGB, GL_SRC_COLOR);
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glTexEnvi (GL_TEXTURE_ENV, GL_OPERAND1_ALPHA, GL_SRC_ALPHA);
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}
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switch (setup->mask.type) {
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case OPERAND_CONSTANT:
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/* Have to have a dummy texture bound in order to use the combiner unit. */
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glBindTexture (GL_TEXTURE_2D, ctx->dummy_tex);
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if (setup->shader) {
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bind_vec4_to_shader(setup->shader->program,
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"constant_mask",
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setup->src.operand.constant.color[0],
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setup->src.operand.constant.color[1],
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setup->src.operand.constant.color[2],
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setup->src.operand.constant.color[3]);
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} else {
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glBindTexture (GL_TEXTURE_2D, ctx->dummy_tex);
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glActiveTexture (GL_TEXTURE1);
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glEnable (GL_TEXTURE_2D);
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glTexEnvfv (GL_TEXTURE_ENV, GL_TEXTURE_ENV_COLOR,
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setup->mask.operand.constant.color);
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glTexEnvi (GL_TEXTURE_ENV, GL_SRC0_RGB, GL_CONSTANT);
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glTexEnvi (GL_TEXTURE_ENV, GL_SRC0_ALPHA, GL_CONSTANT);
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glTexEnvi (GL_TEXTURE_ENV, GL_OPERAND0_RGB, GL_SRC_COLOR);
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glTexEnvi (GL_TEXTURE_ENV, GL_OPERAND0_ALPHA, GL_SRC_ALPHA);
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glTexEnvfv (GL_TEXTURE_ENV, GL_TEXTURE_ENV_COLOR,
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setup->mask.operand.constant.color);
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glTexEnvi (GL_TEXTURE_ENV, GL_SRC0_RGB, GL_CONSTANT);
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glTexEnvi (GL_TEXTURE_ENV, GL_SRC0_ALPHA, GL_CONSTANT);
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glTexEnvi (GL_TEXTURE_ENV, GL_OPERAND0_RGB, GL_SRC_COLOR);
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glTexEnvi (GL_TEXTURE_ENV, GL_OPERAND0_ALPHA, GL_SRC_ALPHA);
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}
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break;
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case OPERAND_TEXTURE:
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_cairo_gl_set_texture_surface (1, setup->mask.operand.texture.tex,
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mask_attributes);
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/* Set up the constant color we use to set color to 0 if needed. */
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glTexEnvfv (GL_TEXTURE_ENV, GL_TEXTURE_ENV_COLOR, constant_color);
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if (!setup->shader) {
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/* Set up the constant color we use to set color to 0 if needed. */
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glTexEnvfv (GL_TEXTURE_ENV, GL_TEXTURE_ENV_COLOR, constant_color);
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/* Force the mask color to 0 if the surface should be alpha-only.
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* We may have a teximage with color bits if the implementation doesn't
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* support GL_ALPHA FBOs.
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*/
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if (setup->mask.operand.texture.surface->base.content !=
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CAIRO_CONTENT_ALPHA)
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glTexEnvi (GL_TEXTURE_ENV, GL_SRC0_RGB, GL_TEXTURE1);
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else
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glTexEnvi (GL_TEXTURE_ENV, GL_SRC0_RGB, GL_CONSTANT);
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glTexEnvi (GL_TEXTURE_ENV, GL_SRC0_ALPHA, GL_TEXTURE1);
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glTexEnvi (GL_TEXTURE_ENV, GL_OPERAND0_RGB, GL_SRC_COLOR);
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glTexEnvi (GL_TEXTURE_ENV, GL_OPERAND0_ALPHA, GL_SRC_ALPHA);
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/* Force the mask color to 0 if the surface should be
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* alpha-only. We may have a teximage with color bits if
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* the implementation doesn't support GL_ALPHA FBOs.
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*/
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if (setup->mask.operand.texture.surface->base.content !=
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CAIRO_CONTENT_ALPHA)
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glTexEnvi (GL_TEXTURE_ENV, GL_SRC0_RGB, GL_TEXTURE1);
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else
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glTexEnvi (GL_TEXTURE_ENV, GL_SRC0_RGB, GL_CONSTANT);
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glTexEnvi (GL_TEXTURE_ENV, GL_SRC0_ALPHA, GL_TEXTURE1);
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glTexEnvi (GL_TEXTURE_ENV, GL_OPERAND0_RGB, GL_SRC_COLOR);
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glTexEnvi (GL_TEXTURE_ENV, GL_OPERAND0_ALPHA, GL_SRC_ALPHA);
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}
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break;
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}
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}
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@ -1387,6 +1409,8 @@ _cairo_gl_surface_composite_component_alpha (cairo_operator_t op,
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int num_vertices, i;
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GLenum err;
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cairo_gl_composite_setup_t setup;
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cairo_gl_shader_program_t *ca_source_program = NULL;
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cairo_gl_shader_program_t *ca_source_alpha_program = NULL;
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if (op != CAIRO_OPERATOR_OVER)
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return UNSUPPORTED ("unsupported component alpha operator");
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@ -1418,6 +1442,27 @@ _cairo_gl_surface_composite_component_alpha (cairo_operator_t op,
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return status;
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}
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status = _cairo_gl_get_program (ctx,
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setup.src.source,
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setup.mask.mask,
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CAIRO_GL_SHADER_IN_CA_SOURCE,
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&ca_source_program);
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if (!_cairo_status_is_error (status)) {
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status = _cairo_gl_get_program (ctx,
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setup.src.source,
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setup.mask.mask,
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CAIRO_GL_SHADER_IN_CA_SOURCE_ALPHA,
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&ca_source_alpha_program);
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if (_cairo_status_is_error (status)) {
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/* We'll fall back to fixed function instead. */
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ca_source_program = NULL;
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status = CAIRO_STATUS_SUCCESS;
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}
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} else {
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/* We'll fall back to fixed function instead. */
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status = CAIRO_STATUS_SUCCESS;
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}
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_cairo_gl_set_destination (dst);
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if (clip_region != NULL) {
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@ -1499,16 +1544,22 @@ _cairo_gl_surface_composite_component_alpha (cairo_operator_t op,
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glEnableClientState (GL_TEXTURE_COORD_ARRAY);
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}
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setup.shader = ca_source_alpha_program;
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_cairo_gl_use_program (setup.shader);
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_cairo_gl_set_operator (dst, CAIRO_OPERATOR_DEST_OUT, TRUE);
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_cairo_gl_set_src_alpha_operand (ctx, &setup);
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_cairo_gl_set_component_alpha_mask_operand (ctx, &setup);
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glDrawArrays (GL_QUADS, 0, num_vertices);
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setup.shader = ca_source_program;
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_cairo_gl_use_program (setup.shader);
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_cairo_gl_set_operator (dst, CAIRO_OPERATOR_ADD, TRUE);
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_cairo_gl_set_src_operand (ctx, &setup);
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_cairo_gl_set_component_alpha_mask_operand (ctx, &setup);
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glDrawArrays (GL_QUADS, 0, num_vertices);
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glDisable (GL_BLEND);
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_cairo_gl_use_program (NULL);
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glDisableClientState (GL_VERTEX_ARRAY);
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@ -1635,7 +1686,7 @@ _cairo_gl_surface_composite (cairo_operator_t op,
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if (mask != NULL) {
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switch (setup.mask.type) {
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case OPERAND_CONSTANT:
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_cairo_gl_set_tex_combine_constant_color (ctx, 1,
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_cairo_gl_set_tex_combine_constant_color (ctx, &setup, 1,
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setup.mask.operand.constant.color);
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break;
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