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gsk: Add ShaderBuilder
GskShaderBuilder is an ancillary, private type that deals with the internals of taking GLSL shaders from resources and building them, with the additional feature of being able to compose shaders from a common preamble, as well as adding conditional defines (useful for enabling debugging code in the shaders themselves).
This commit is contained in:
Emmanuele Bassi
parent
3d21c4afba
commit
2ded2ad6b7
@ -38,9 +38,10 @@ gsk_private_source_h = \
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gskcairorendererprivate.h \
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gskdebugprivate.h \
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gskglrendererprivate.h \
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gskprivate.h \
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gskrendererprivate.h \
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gskrendernodeprivate.h \
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gskprivate.h
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gskshaderbuilderprivate.h
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gsk_private_source_c = \
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gskprivate.c
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gsk_built_source_h = \
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@ -55,7 +56,8 @@ gsk_source_c = \
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gskglrenderer.c \
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gskrenderer.c \
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gskrendernode.c \
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gskrendernodeiter.c
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gskrendernodeiter.c \
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gskshaderbuilder.c
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all_sources = \
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$(gsk_public_source_h) \
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359
gsk/gskshaderbuilder.c
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359
gsk/gskshaderbuilder.c
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@ -0,0 +1,359 @@
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#include "config.h"
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#include "gskshaderbuilderprivate.h"
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#include <gdk/gdk.h>
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#include <epoxy/gl.h>
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struct _GskShaderBuilder
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{
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GObject parent_instance;
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char *resource_base_path;
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int version;
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int program_id;
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GPtrArray *defines;
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GPtrArray *uniforms;
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GPtrArray *attributes;
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GHashTable *uniform_locations;
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GHashTable *attribute_locations;
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};
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G_DEFINE_TYPE (GskShaderBuilder, gsk_shader_builder, G_TYPE_OBJECT)
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static void
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gsk_shader_builder_finalize (GObject *gobject)
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{
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GskShaderBuilder *self = GSK_SHADER_BUILDER (gobject);
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g_free (self->resource_base_path);
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g_clear_pointer (&self->defines, g_ptr_array_unref);
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g_clear_pointer (&self->uniforms, g_ptr_array_unref);
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g_clear_pointer (&self->attributes, g_ptr_array_unref);
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g_clear_pointer (&self->uniform_locations, g_hash_table_unref);
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g_clear_pointer (&self->attribute_locations, g_hash_table_unref);
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G_OBJECT_CLASS (gsk_shader_builder_parent_class)->finalize (gobject);
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}
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static void
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gsk_shader_builder_class_init (GskShaderBuilderClass *klass)
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{
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G_OBJECT_CLASS (klass)->finalize = gsk_shader_builder_finalize;
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}
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static void
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gsk_shader_builder_init (GskShaderBuilder *self)
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{
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self->defines = g_ptr_array_new_with_free_func (g_free);
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self->uniforms = g_ptr_array_new_with_free_func (g_free);
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self->attributes = g_ptr_array_new_with_free_func (g_free);
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self->uniform_locations = g_hash_table_new (g_direct_hash, g_direct_equal);
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self->attribute_locations = g_hash_table_new (g_direct_hash, g_direct_equal);
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}
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GskShaderBuilder *
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gsk_shader_builder_new (void)
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{
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return g_object_new (GSK_TYPE_SHADER_BUILDER, NULL);
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}
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void
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gsk_shader_builder_set_resource_base_path (GskShaderBuilder *builder,
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const char *base_path)
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{
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g_return_if_fail (GSK_IS_SHADER_BUILDER (builder));
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g_free (builder->resource_base_path);
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builder->resource_base_path = g_strdup (base_path);
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}
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void
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gsk_shader_builder_set_version (GskShaderBuilder *builder,
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int version)
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{
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g_return_if_fail (GSK_IS_SHADER_BUILDER (builder));
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builder->version = version;
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}
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void
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gsk_shader_builder_add_define (GskShaderBuilder *builder,
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const char *define_name,
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const char *define_value)
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{
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g_return_if_fail (GSK_IS_SHADER_BUILDER (builder));
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g_return_if_fail (define_name != NULL && *define_name != '\0');
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g_return_if_fail (define_value != NULL && *define_name != '\0');
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g_ptr_array_add (builder->defines, g_strdup (define_name));
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g_ptr_array_add (builder->defines, g_strdup (define_value));
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}
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GQuark
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gsk_shader_builder_add_uniform (GskShaderBuilder *builder,
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const char *uniform_name)
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{
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g_return_val_if_fail (GSK_IS_SHADER_BUILDER (builder), 0);
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g_return_val_if_fail (uniform_name != NULL, 0);
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g_ptr_array_add (builder->uniforms, g_strdup (uniform_name));
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return g_quark_from_string (uniform_name);
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}
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GQuark
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gsk_shader_builder_add_attribute (GskShaderBuilder *builder,
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const char *attribute_name)
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{
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g_return_val_if_fail (GSK_IS_SHADER_BUILDER (builder), 0);
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g_return_val_if_fail (attribute_name != NULL, 0);
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g_ptr_array_add (builder->attributes, g_strdup (attribute_name));
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return g_quark_from_string (attribute_name);
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}
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static gboolean
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lookup_shader_code (GString *code,
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const char *base_path,
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const char *shader_file,
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GError **error)
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{
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GBytes *source;
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char *path;
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if (base_path != NULL)
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path = g_build_filename (base_path, shader_file, NULL);
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else
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path = g_strdup (shader_file);
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source = g_resources_lookup_data (path, 0, error);
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g_free (path);
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if (source == NULL)
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return FALSE;
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g_string_append (code, g_bytes_get_data (source, NULL));
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g_bytes_unref (source);
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return TRUE;
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}
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int
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gsk_shader_builder_compile_shader (GskShaderBuilder *builder,
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int shader_type,
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const char *shader_preamble,
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const char *shader_source,
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GError **error)
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{
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GString *code;
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char *source;
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int shader_id;
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int status;
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int i;
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g_return_val_if_fail (GSK_IS_SHADER_BUILDER (builder), -1);
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g_return_val_if_fail (shader_source != NULL, -1);
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code = g_string_new (NULL);
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if (builder->version > 0)
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{
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g_string_append_printf (code, "#version %d\n", builder->version);
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g_string_append_c (code, '\n');
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}
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for (i = 0; i < builder->defines->len; i += 2)
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{
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const char *name = g_ptr_array_index (builder->defines, i);
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const char *value = g_ptr_array_index (builder->defines, i + 1);
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g_string_append (code, "#define");
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g_string_append_c (code, ' ');
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g_string_append (code, name);
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g_string_append_c (code, ' ');
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g_string_append (code, value);
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g_string_append_c (code, '\n');
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if (i == builder->defines->len - 2)
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g_string_append_c (code, '\n');
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}
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if (!lookup_shader_code (code, builder->resource_base_path, shader_preamble, error))
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{
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g_string_free (code, TRUE);
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return -1;
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}
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if (!lookup_shader_code (code, builder->resource_base_path, shader_source, error))
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{
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g_string_free (code, TRUE);
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return -1;
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}
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source = g_string_free (code, FALSE);
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shader_id = glCreateShader (shader_type);
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glShaderSource (shader_id, 1, (const GLchar **) &source, NULL);
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glCompileShader (shader_id);
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g_free (source);
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glGetShaderiv (shader_id, GL_COMPILE_STATUS, &status);
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if (status == GL_FALSE)
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{
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int log_len;
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char *buffer;
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glGetShaderiv (shader_id, GL_INFO_LOG_LENGTH, &log_len);
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buffer = g_malloc0 (log_len + 1);
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glGetShaderInfoLog (shader_id, log_len, NULL, buffer);
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g_set_error (error, GDK_GL_ERROR, GDK_GL_ERROR_COMPILATION_FAILED,
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"Compilation failure in %s shader:\n%s",
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shader_type == GL_VERTEX_SHADER ? "vertex" : "fragment",
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buffer);
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g_free (buffer);
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glDeleteShader (shader_id);
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return -1;
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}
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return shader_id;
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}
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static void
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gsk_shader_builder_cache_uniforms (GskShaderBuilder *builder,
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int program_id)
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{
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int i;
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for (i = 0; i < builder->uniforms->len; i++)
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{
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const char *uniform = g_ptr_array_index (builder->uniforms, i);
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int loc = glGetUniformLocation (program_id, uniform);
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g_hash_table_insert (builder->uniform_locations,
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GINT_TO_POINTER (g_quark_from_string (uniform)),
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GINT_TO_POINTER (loc));
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}
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}
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static void
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gsk_shader_builder_cache_attributes (GskShaderBuilder *builder,
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int program_id)
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{
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int i;
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for (i = 0; i < builder->attributes->len; i++)
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{
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const char *attribute = g_ptr_array_index (builder->attributes, i);
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int loc = glGetAttribLocation (program_id, attribute);
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g_hash_table_insert (builder->attribute_locations,
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GINT_TO_POINTER (g_quark_from_string (attribute)),
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GINT_TO_POINTER (loc));
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}
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}
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int
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gsk_shader_builder_create_program (GskShaderBuilder *builder,
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int vertex_id,
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int fragment_id,
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GError **error)
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{
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int program_id;
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int status;
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g_return_val_if_fail (GSK_IS_SHADER_BUILDER (builder), -1);
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g_return_val_if_fail (vertex_id > 0, -1);
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g_return_val_if_fail (fragment_id > 0, -1);
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program_id = glCreateProgram ();
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glAttachShader (program_id, vertex_id);
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glAttachShader (program_id, fragment_id);
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glLinkProgram (program_id);
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glGetProgramiv (program_id, GL_LINK_STATUS, &status);
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if (status == GL_FALSE)
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{
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char *buffer = NULL;
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int log_len = 0;
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glGetProgramiv (program_id, GL_INFO_LOG_LENGTH, &log_len);
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buffer = g_malloc0 (log_len + 1);
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glGetProgramInfoLog (program_id, log_len, NULL, buffer);
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g_set_error (error, GDK_GL_ERROR, GDK_GL_ERROR_LINK_FAILED,
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"Linking failure in shader:\n%s", buffer);
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g_free (buffer);
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glDeleteProgram (program_id);
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program_id = -1;
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goto out;
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}
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gsk_shader_builder_cache_uniforms (builder, program_id);
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gsk_shader_builder_cache_attributes (builder, program_id);
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builder->program_id = program_id;
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out:
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glDetachShader (program_id, vertex_id);
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glDetachShader (program_id, fragment_id);
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return program_id;
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}
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int
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gsk_shader_builder_get_uniform_location (GskShaderBuilder *builder,
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GQuark uniform_quark)
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{
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gpointer loc_p = NULL;
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g_return_val_if_fail (GSK_IS_SHADER_BUILDER (builder), -1);
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if (builder->program_id < 0)
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return -1;
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if (builder->uniforms->len == 0)
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return -1;
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if (g_hash_table_lookup_extended (builder->uniform_locations, GINT_TO_POINTER (uniform_quark), NULL, &loc_p))
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return GPOINTER_TO_INT (loc_p);
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return -1;
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}
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int
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gsk_shader_builder_get_attribute_location (GskShaderBuilder *builder,
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GQuark attribute_quark)
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{
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gpointer loc_p = NULL;
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g_return_val_if_fail (GSK_IS_SHADER_BUILDER (builder), -1);
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if (builder->program_id < 0)
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return -1;
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if (builder->attributes->len == 0)
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return -1;
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if (g_hash_table_lookup_extended (builder->attribute_locations, GINT_TO_POINTER (attribute_quark), NULL, &loc_p))
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return GPOINTER_TO_INT (loc_p);
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return -1;
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}
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45
gsk/gskshaderbuilderprivate.h
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45
gsk/gskshaderbuilderprivate.h
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@ -0,0 +1,45 @@
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#ifndef __GSK_SHADER_BUILDER_PRIVATE_H__
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#define __GSK_SHADER_BUILDER_PRIVATE_H__
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#include <gdk/gdk.h>
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#include <graphene.h>
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G_BEGIN_DECLS
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#define GSK_TYPE_SHADER_BUILDER (gsk_shader_builder_get_type ())
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G_DECLARE_FINAL_TYPE (GskShaderBuilder, gsk_shader_builder, GSK, SHADER_BUILDER, GObject)
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GskShaderBuilder * gsk_shader_builder_new (void);
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void gsk_shader_builder_set_version (GskShaderBuilder *builder,
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int version);
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void gsk_shader_builder_set_resource_base_path (GskShaderBuilder *builder,
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const char *base_path);
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GQuark gsk_shader_builder_add_uniform (GskShaderBuilder *builder,
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const char *uniform_name);
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GQuark gsk_shader_builder_add_attribute (GskShaderBuilder *builder,
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const char *attribute_name);
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void gsk_shader_builder_add_define (GskShaderBuilder *builder,
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const char *define_name,
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const char *define_value);
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int gsk_shader_builder_compile_shader (GskShaderBuilder *builder,
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int shader_type,
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const char *shader_preamble,
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const char *shader_source,
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GError **error);
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int gsk_shader_builder_create_program (GskShaderBuilder *builder,
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int vertex_id,
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int fragment_id,
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GError **error);
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int gsk_shader_builder_get_uniform_location (GskShaderBuilder *builder,
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GQuark uniform_quark);
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int gsk_shader_builder_get_attribute_location (GskShaderBuilder *builder,
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GQuark attribute_quark);
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G_END_DECLS
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#endif /* __GSK_SHADER_BUILDER_PRIVATE_H__ */
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