mirror of
https://gitlab.freedesktop.org/cairo/cairo.git
synced 2026-03-15 18:30:36 +01:00
gl: Move texture setup code into its own file
This ensures textures don't need to be (re)set when doing component alpha and running 2 shaders.
This commit is contained in:
Benjamin Otte
parent
970c879dd8
commit
73262edd82
1 changed files with 92 additions and 116 deletions
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@ -43,56 +43,6 @@
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#include "cairo-error-private.h"
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#include "cairo-gl-private.h"
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static void
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_cairo_gl_set_texture_surface (int tex_unit, GLuint tex,
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cairo_surface_attributes_t *attributes,
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GLint tex_target)
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{
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if (tex_target == GL_TEXTURE_RECTANGLE_EXT) {
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assert (attributes->extend != CAIRO_EXTEND_REPEAT &&
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attributes->extend != CAIRO_EXTEND_REFLECT);
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}
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glActiveTexture (GL_TEXTURE0 + tex_unit);
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glBindTexture (tex_target, tex);
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switch (attributes->extend) {
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case CAIRO_EXTEND_NONE:
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glTexParameteri (tex_target, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_BORDER);
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glTexParameteri (tex_target, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_BORDER);
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break;
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case CAIRO_EXTEND_PAD:
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glTexParameteri (tex_target, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
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glTexParameteri (tex_target, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
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break;
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case CAIRO_EXTEND_REPEAT:
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glTexParameteri (tex_target, GL_TEXTURE_WRAP_S, GL_REPEAT);
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glTexParameteri (tex_target, GL_TEXTURE_WRAP_T, GL_REPEAT);
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break;
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case CAIRO_EXTEND_REFLECT:
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glTexParameteri (tex_target, GL_TEXTURE_WRAP_S, GL_MIRRORED_REPEAT);
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glTexParameteri (tex_target, GL_TEXTURE_WRAP_T, GL_MIRRORED_REPEAT);
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break;
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}
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switch (attributes->filter) {
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case CAIRO_FILTER_FAST:
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case CAIRO_FILTER_NEAREST:
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glTexParameteri (tex_target, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
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glTexParameteri (tex_target, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
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break;
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case CAIRO_FILTER_GOOD:
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case CAIRO_FILTER_BEST:
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case CAIRO_FILTER_BILINEAR:
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glTexParameteri (tex_target, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
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glTexParameteri (tex_target, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
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break;
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default:
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case CAIRO_FILTER_GAUSSIAN:
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ASSERT_NOT_REACHED;
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}
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glEnable (tex_target);
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}
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static int
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_cairo_gl_gradient_sample_width (const cairo_gradient_pattern_t *gradient)
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{
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@ -610,17 +560,99 @@ _cairo_gl_composite_bind_to_shader (cairo_gl_context_t *ctx,
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_cairo_gl_operand_bind_to_shader (ctx, &setup->mask, "mask");
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}
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static void
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_cairo_gl_texture_set_attributes (cairo_gl_context_t *ctx,
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cairo_surface_attributes_t *attributes)
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{
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if (ctx->tex_target == GL_TEXTURE_RECTANGLE_EXT) {
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assert (attributes->extend != CAIRO_EXTEND_REPEAT &&
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attributes->extend != CAIRO_EXTEND_REFLECT);
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}
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switch (attributes->extend) {
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case CAIRO_EXTEND_NONE:
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glTexParameteri (ctx->tex_target, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_BORDER);
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glTexParameteri (ctx->tex_target, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_BORDER);
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break;
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case CAIRO_EXTEND_PAD:
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glTexParameteri (ctx->tex_target, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
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glTexParameteri (ctx->tex_target, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
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break;
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case CAIRO_EXTEND_REPEAT:
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glTexParameteri (ctx->tex_target, GL_TEXTURE_WRAP_S, GL_REPEAT);
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glTexParameteri (ctx->tex_target, GL_TEXTURE_WRAP_T, GL_REPEAT);
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break;
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case CAIRO_EXTEND_REFLECT:
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glTexParameteri (ctx->tex_target, GL_TEXTURE_WRAP_S, GL_MIRRORED_REPEAT);
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glTexParameteri (ctx->tex_target, GL_TEXTURE_WRAP_T, GL_MIRRORED_REPEAT);
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break;
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}
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switch (attributes->filter) {
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case CAIRO_FILTER_FAST:
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case CAIRO_FILTER_NEAREST:
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glTexParameteri (ctx->tex_target, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
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glTexParameteri (ctx->tex_target, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
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break;
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case CAIRO_FILTER_GOOD:
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case CAIRO_FILTER_BEST:
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case CAIRO_FILTER_BILINEAR:
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glTexParameteri (ctx->tex_target, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
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glTexParameteri (ctx->tex_target, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
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break;
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default:
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case CAIRO_FILTER_GAUSSIAN:
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ASSERT_NOT_REACHED;
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}
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}
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static void
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_cairo_gl_operand_setup_texture (cairo_gl_context_t *ctx,
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cairo_gl_operand_t *operand,
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GLuint tex_unit)
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{
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switch (operand->type) {
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default:
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case CAIRO_GL_OPERAND_COUNT:
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ASSERT_NOT_REACHED;
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case CAIRO_GL_OPERAND_NONE:
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case CAIRO_GL_OPERAND_SPANS:
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break;
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case CAIRO_GL_OPERAND_CONSTANT:
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if (ctx->current_shader == NULL) {
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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 (ctx->tex_target, ctx->dummy_tex);
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glEnable (ctx->tex_target);
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} else {
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glDisable (ctx->tex_target);
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}
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break;
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case CAIRO_GL_OPERAND_TEXTURE:
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glActiveTexture (GL_TEXTURE0 + tex_unit);
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glBindTexture (ctx->tex_target, operand->texture.tex);
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glEnable (ctx->tex_target);
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_cairo_gl_texture_set_attributes (ctx, &operand->texture.attributes);
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break;
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case CAIRO_GL_OPERAND_LINEAR_GRADIENT:
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glActiveTexture (GL_TEXTURE0 + tex_unit);
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glBindTexture (GL_TEXTURE_1D, operand->linear.tex);
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glEnable (GL_TEXTURE_1D);
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break;
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case CAIRO_GL_OPERAND_RADIAL_GRADIENT:
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glActiveTexture (GL_TEXTURE0 + tex_unit);
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glBindTexture (GL_TEXTURE_1D, operand->radial.tex);
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glEnable (GL_TEXTURE_1D);
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break;
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}
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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,
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cairo_gl_composite_t *setup,
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int tex_unit,
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GLfloat *color)
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{
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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 (ctx->tex_target, ctx->dummy_tex);
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glEnable (ctx->tex_target);
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glTexEnvfv (GL_TEXTURE_ENV, GL_TEXTURE_ENV_COLOR, color);
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glTexEnvi (GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_COMBINE);
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if (tex_unit == 0) {
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@ -661,8 +693,6 @@ _cairo_gl_set_src_operand (cairo_gl_context_t *ctx,
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setup->src.constant.color);
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break;
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case CAIRO_GL_OPERAND_TEXTURE:
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_cairo_gl_set_texture_surface (0, setup->src.texture.tex,
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src_attributes, ctx->tex_target);
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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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@ -686,22 +716,13 @@ _cairo_gl_set_src_operand (cairo_gl_context_t *ctx,
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}
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break;
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case CAIRO_GL_OPERAND_LINEAR_GRADIENT:
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glActiveTexture (GL_TEXTURE0);
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glBindTexture (GL_TEXTURE_1D, setup->src.linear.tex);
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glEnable (GL_TEXTURE_1D);
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break;
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case CAIRO_GL_OPERAND_RADIAL_GRADIENT:
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glActiveTexture (GL_TEXTURE0);
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glBindTexture (GL_TEXTURE_1D, setup->src.linear.tex);
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glEnable (GL_TEXTURE_1D);
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break;
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default:
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case CAIRO_GL_OPERAND_COUNT:
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ASSERT_NOT_REACHED;
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case CAIRO_GL_OPERAND_NONE:
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case CAIRO_GL_OPERAND_SPANS:
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case CAIRO_GL_OPERAND_LINEAR_GRADIENT:
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case CAIRO_GL_OPERAND_RADIAL_GRADIENT:
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break;
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}
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}
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@ -729,8 +750,6 @@ _cairo_gl_set_src_alpha_operand (cairo_gl_context_t *ctx,
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constant_color);
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break;
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case CAIRO_GL_OPERAND_TEXTURE:
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_cairo_gl_set_texture_surface (0, setup->src.texture.tex,
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src_attributes, ctx->tex_target);
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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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@ -754,28 +773,6 @@ _cairo_gl_set_src_alpha_operand (cairo_gl_context_t *ctx,
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}
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}
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static void
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_cairo_gl_set_linear_gradient_mask_operand (cairo_gl_context_t *ctx,
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cairo_gl_composite_t *setup)
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{
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assert(setup->shader);
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glActiveTexture (GL_TEXTURE1);
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glBindTexture (GL_TEXTURE_1D, setup->mask.linear.tex);
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glEnable (GL_TEXTURE_1D);
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}
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static void
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_cairo_gl_set_radial_gradient_mask_operand (cairo_gl_context_t *ctx,
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cairo_gl_composite_t *setup)
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{
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assert(setup->shader);
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glActiveTexture (GL_TEXTURE1);
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glBindTexture (GL_TEXTURE_1D, setup->mask.radial.tex);
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glEnable (GL_TEXTURE_1D);
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}
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/* This is like _cairo_gl_set_src_alpha_operand, for component alpha setup
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* of the mask part of IN to produce a "source alpha" value.
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*/
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@ -803,10 +800,6 @@ _cairo_gl_set_component_alpha_mask_operand (cairo_gl_context_t *ctx,
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case CAIRO_GL_OPERAND_CONSTANT:
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/* Have to have a dummy texture bound in order to use the combiner unit. */
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if (! setup->shader) {
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glBindTexture (ctx->tex_target, ctx->dummy_tex);
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glActiveTexture (GL_TEXTURE1);
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glEnable (ctx->tex_target);
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glTexEnvfv (GL_TEXTURE_ENV, GL_TEXTURE_ENV_COLOR,
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setup->mask.constant.color);
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@ -817,8 +810,6 @@ _cairo_gl_set_component_alpha_mask_operand (cairo_gl_context_t *ctx,
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}
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break;
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case CAIRO_GL_OPERAND_TEXTURE:
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_cairo_gl_set_texture_surface (1, setup->mask.texture.tex,
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mask_attributes, ctx->tex_target);
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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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@ -839,12 +830,7 @@ _cairo_gl_set_component_alpha_mask_operand (cairo_gl_context_t *ctx,
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break;
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case CAIRO_GL_OPERAND_LINEAR_GRADIENT:
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_cairo_gl_set_linear_gradient_mask_operand (ctx, setup);
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break;
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case CAIRO_GL_OPERAND_RADIAL_GRADIENT:
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_cairo_gl_set_radial_gradient_mask_operand (ctx, setup);
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break;
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case CAIRO_GL_OPERAND_NONE:
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case CAIRO_GL_OPERAND_SPANS:
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case CAIRO_GL_OPERAND_COUNT:
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@ -865,10 +851,6 @@ _cairo_gl_set_mask_operand (cairo_gl_context_t *ctx,
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break;
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case CAIRO_GL_OPERAND_TEXTURE:
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_cairo_gl_set_texture_surface (1, setup->mask.texture.tex,
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&setup->mask.texture.attributes,
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ctx->tex_target);
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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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@ -887,20 +869,11 @@ _cairo_gl_set_mask_operand (cairo_gl_context_t *ctx,
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}
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break;
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case CAIRO_GL_OPERAND_LINEAR_GRADIENT:
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_cairo_gl_set_linear_gradient_mask_operand (ctx, setup);
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break;
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case CAIRO_GL_OPERAND_RADIAL_GRADIENT:
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_cairo_gl_set_radial_gradient_mask_operand (ctx, setup);
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break;
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case CAIRO_GL_OPERAND_NONE:
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break;
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case CAIRO_GL_OPERAND_SPANS:
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if (! setup->shader) {
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/* Set up the mask to source from the incoming vertex color. */
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glActiveTexture (GL_TEXTURE1);
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/* Have to have a dummy texture bound in order to use the combiner unit. */
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glBindTexture (ctx->tex_target, ctx->dummy_tex);
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glEnable (ctx->tex_target);
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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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@ -1137,6 +1110,9 @@ _cairo_gl_composite_begin (cairo_gl_context_t *ctx,
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_cairo_gl_set_shader (ctx, setup->shader);
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_cairo_gl_composite_bind_to_shader (ctx, setup);
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_cairo_gl_operand_setup_texture (ctx, &setup->src, 0);
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_cairo_gl_operand_setup_texture (ctx, &setup->mask, 1);
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glBindBufferARB (GL_ARRAY_BUFFER_ARB, ctx->vbo);
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glVertexPointer (2, GL_FLOAT, setup->vertex_size, NULL);
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