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gsk: Add some more shader docs

Browse Source 
Do a pass over the docs and address minor inconsistencies,
cosmetics and formatting differences.

Mention GSK_DEBUG=shaders.
This commit is contained in:
Matthias Clasen
2020-09-29 11:32:03 -04:00
parent 687ed74d46
commit 00c6340777
2 changed files with 153 additions and 142 deletions
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285
gsk/gskglshader.c
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@@ -62,7 +62,7 @@
* in vec2 resolution,
* in vec2 uv)
* ]|
*
*
* Where the input @fragCoord is the coordinate of the pixel we're
* currently rendering, relative to the boundary rectangle that was
* specified in the #GskGLShaderNode, and @resolution is the width and
@@ -70,7 +70,7 @@
* system with the origin in the top left. @uv contains the u and v
* coordinates that can be used to index a texture at the
* corresponding point. These coordinates are in the [0..1]x[0..1]
* region, with 0, 0 being in the lower left cornder (which is typical
* region, with 0, 0 being in the lower left corder (which is typical
* for OpenGL).
*
* The output @fragColor should be a RGBA color (with
@@ -109,6 +109,13 @@
* coordinates, and containes some helper ifdefs to ensure that
* it works on all OpenGL versions.
*
* You can compile the shader yourself using gsk_gl_shader_compile(),
* otherwise the GSK renderer will do it when it handling the glshader
* node. If errors occurs, the returned @error will include the glsl
* sources, so you can see what GSK was passing to the compiler. You
* can also set GSK_DEBUG=shaders in the environment to see the sources
* and other relevant information about all shaders that GSK is handling.
*
* # An example shader
*
* |[<!-- language="plain" -->
@@ -448,7 +455,10 @@ gsk_gl_shader_class_init (GskGLShaderClass *klass)
/**
* GskGLShader:resource:
*
* resource containing the source code for the shader.
* Resource containing the source code for the shader.
*
* If the shader source is not coming from a resource, this
* will be %NULL.
*/
gsk_gl_shader_properties[GLSHADER_PROP_RESOURCE] =
g_param_spec_string ("resource",
@@ -470,7 +480,7 @@ gsk_gl_shader_init (GskGLShader *shader)
/**
* gsk_gl_shader_new_from_bytes:
* @sourcecode: The sourcecode for the shader, as a #GBytes
* @sourcecode: GLSL sourcecode for the shader, as a #GBytes
*
* Creates a #GskGLShader that will render pixels using the specified code.
*
@@ -488,14 +498,15 @@ gsk_gl_shader_new_from_bytes (GBytes *sourcecode)
/**
* gsk_gl_shader_new_from_resource:
* @resource_path: valid path to a resource that contains the sourcecode for the shader
* @resource_path: path to a resource that contains the GLSL sourcecode for
* the shader
*
* Creates a #GskGLShader that will render pixels using the specified code.
*
* Returns: (transfer full): A new #GskGLShader
*/
GskGLShader *
gsk_gl_shader_new_from_resource (const char *resource_path)
gsk_gl_shader_new_from_resource (const char *resource_path)
{
g_return_val_if_fail (resource_path != NULL, NULL);
@@ -506,14 +517,14 @@ gsk_gl_shader_new_from_resource (const char *resource_path)
/**
* gsk_gl_shader_compile:
* @shader: A #GskGLShader
* @renderer: A #GskRenderer
* @error: Location to store error int
* @shader: a #GskGLShader
* @renderer: a #GskRenderer
* @error: location to store error in
*
* Tries to compile the @shader for the given @renderer, and reports
* %FALSE with an error if there is a problem. You should use this
* before relying on the shader for rendering and use a fallback with
* a simpler shader or without shaders if it fails.
* function before relying on the shader for rendering and use a
* fallback with a simpler shader or without shaders if it fails.
*
* Note that this will modify the rendering state (for example
* change the current GL context) and requires the renderer to be
@@ -524,9 +535,9 @@ gsk_gl_shader_new_from_resource (const char *resource_path)
* Returns: %TRUE on success, %FALSE if an error occurred
*/
gboolean
gsk_gl_shader_compile (GskGLShader *shader,
GskRenderer *renderer,
GError **error)
gsk_gl_shader_compile (GskGLShader *shader,
GskRenderer *renderer,
GError **error)
{
g_return_val_if_fail (GSK_IS_GL_SHADER (shader), FALSE);
@@ -542,9 +553,9 @@ gsk_gl_shader_compile (GskGLShader *shader,
/**
* gsk_gl_shader_get_source:
* @shader: A #GskGLShader
* @shader: a #GskGLShader
*
* Get the source code being used to render this shader.
* Gets the GLSL sourcecode being used to render this shader.
*
* Returns: (transfer none): The source code for the shader
*/
@@ -558,11 +569,13 @@ gsk_gl_shader_get_source (GskGLShader *shader)
/**
* gsk_gl_shader_get_resource:
* @shader: A #GskGLShader
* @shader: a #GskGLShader
*
* Get the resource path for the sourcecode being used to render this shader.
* Gets the resource path for the GLSL sourcecode being used
* to render this shader.
*
* Returns: (transfer none): The resource path for the shader, or %NULL if none.
* Returns: (transfer none): The resource path for the shader,
* or %NULL if none.
*/
const char *
gsk_gl_shader_get_resource (GskGLShader *shader)
@@ -574,17 +587,18 @@ gsk_gl_shader_get_resource (GskGLShader *shader)
/**
* gsk_gl_shader_get_n_textures:
* @shader: A #GskGLShader
* @shader: a #GskGLShader
*
* Returns the number of textures that the shader requires. This can be used
* to check that the a passed shader works in your usecase. This
* is determined by looking at the highest u_textureN value that the
* shader defines.
* Returns the number of textures that the shader requires.
*
* Returns: The nr of texture input this shader requires.
* This can be used to check that the a passed shader works
* in your usecase. It is determined by looking at the highest
* u_textureN value that the shader defines.
*
* Returns: The number of texture inputs required by @shader
*/
int
gsk_gl_shader_get_n_textures (GskGLShader *shader)
gsk_gl_shader_get_n_textures (GskGLShader *shader)
{
g_return_val_if_fail (GSK_IS_GL_SHADER (shader), 0);
@@ -593,14 +607,14 @@ gsk_gl_shader_get_n_textures (GskGLShader *shader)
/**
* gsk_gl_shader_get_n_uniforms:
* @shader: A #GskGLShader
* @shader: a #GskGLShader
*
* Get the number of declared uniforms for this shader.
*
* Returns: The nr of declared uniforms
* Returns: The number of declared uniforms
*/
int
gsk_gl_shader_get_n_uniforms (GskGLShader *shader)
gsk_gl_shader_get_n_uniforms (GskGLShader *shader)
{
g_return_val_if_fail (GSK_IS_GL_SHADER (shader), 0);
@@ -609,16 +623,16 @@ gsk_gl_shader_get_n_uniforms (GskGLShader *shader)
/**
* gsk_gl_shader_get_uniform_name:
* @shader: A #GskGLShader
* @idx: A zero-based index of the uniforms
* @shader: a #GskGLShader
* @idx: index of the uniform
*
* Get the name of a declared uniforms for this shader at index @indx.
* Get the name of the declared uniform for this shader at index @idx.
*
* Returns: (transfer none): The name of the declared uniform
*/
const char *
gsk_gl_shader_get_uniform_name (GskGLShader *shader,
int idx)
gsk_gl_shader_get_uniform_name (GskGLShader *shader,
int idx)
{
g_return_val_if_fail (GSK_IS_GL_SHADER (shader), NULL);
@@ -627,17 +641,17 @@ gsk_gl_shader_get_uniform_name (GskGLShader *shader,
/**
* gsk_gl_shader_find_uniform_by_name:
* @shader: A #GskGLShader
* @name: A uniform name
* @shader: a #GskGLShader
* @name: uniform name
*
* Looks for a uniform by the name @name, and returns the index
* of the unifor, or -1 if it was not found.
* of the uniform, or -1 if it was not found.
*
* Returns: The index of the uniform, or -1
*/
int
gsk_gl_shader_find_uniform_by_name (GskGLShader *shader,
const char *name)
gsk_gl_shader_find_uniform_by_name (GskGLShader *shader,
const char *name)
{
g_return_val_if_fail (GSK_IS_GL_SHADER (shader), -1);
@@ -653,16 +667,16 @@ gsk_gl_shader_find_uniform_by_name (GskGLShader *shader,
/**
* gsk_gl_shader_get_uniform_type:
* @shader: A #GskGLShader
* @idx: A zero-based index of the uniforms
* @shader: a #GskGLShader
* @idx: index of the uniform
*
* Get the type of a declared uniforms for this shader at index @indx.
* Get the type of the declared uniform for this shader at index @idx.
*
* Returns: The type of the declared uniform
*/
GskGLUniformType
gsk_gl_shader_get_uniform_type (GskGLShader *shader,
int idx)
gsk_gl_shader_get_uniform_type (GskGLShader *shader,
int idx)
{
g_return_val_if_fail (GSK_IS_GL_SHADER (shader), 0);
@@ -671,16 +685,16 @@ gsk_gl_shader_get_uniform_type (GskGLShader *shader,
/**
* gsk_gl_shader_get_uniform_offset:
* @shader: A #GskGLShader
* @idx: A zero-based index of the uniforms
* @shader: a #GskGLShader
* @idx: index of the uniform
*
* Get the offset into the data block where data for this uniforms is stored.
*
* Returns: The data offset
*/
int
gsk_gl_shader_get_uniform_offset (GskGLShader *shader,
int idx)
gsk_gl_shader_get_uniform_offset (GskGLShader *shader,
int idx)
{
g_return_val_if_fail (GSK_IS_GL_SHADER (shader), 0);
@@ -697,7 +711,7 @@ gsk_gl_shader_get_uniforms (GskGLShader *shader,
/**
* gsk_gl_shader_get_args_size:
* @shader: A #GskGLShader
* @shader: a #GskGLShader
*
* Get the size of the data block used to specify arguments for this shader.
*
@@ -713,7 +727,7 @@ gsk_gl_shader_get_args_size (GskGLShader *shader)
static const GskGLUniform *
gsk_gl_shader_find_uniform (GskGLShader *shader,
const char *name)
const char *name)
{
for (int i = 0; i < shader->uniforms->len; i++)
{
@@ -727,9 +741,9 @@ gsk_gl_shader_find_uniform (GskGLShader *shader,
/**
* gsk_gl_shader_get_arg_float:
* @shader: A #GskGLShader
* @args: The uniform arguments
* @idx: The index of the uniform
* @shader: a #GskGLShader
* @args: uniform arguments
* @idx: index of the uniform
*
* Gets the value of the uniform @idx in the @args block.
* The uniform must be of float type.
@@ -738,7 +752,7 @@ gsk_gl_shader_find_uniform (GskGLShader *shader,
*/
float
gsk_gl_shader_get_arg_float (GskGLShader *shader,
GBytes *args,
GBytes *args,
int idx)
{
const GskGLUniform *u;
@@ -759,9 +773,9 @@ gsk_gl_shader_get_arg_float (GskGLShader *shader,
/**
* gsk_gl_shader_get_arg_int:
* @shader: A #GskGLShader
* @args: The uniform arguments
* @idx: The index of the uniform
* @shader: a #GskGLShader
* @args: uniform arguments
* @idx: index of the uniform
*
* Gets the value of the uniform @idx in the @args block.
* The uniform must be of int type.
@@ -770,7 +784,7 @@ gsk_gl_shader_get_arg_float (GskGLShader *shader,
*/
gint32
gsk_gl_shader_get_arg_int (GskGLShader *shader,
GBytes *args,
GBytes *args,
int idx)
{
const GskGLUniform *u;
@@ -791,9 +805,9 @@ gsk_gl_shader_get_arg_int (GskGLShader *shader,
/**
* gsk_gl_shader_get_arg_uint:
* @shader: A #GskGLShader
* @args: The uniform arguments
* @idx: The index of the uniform
* @shader: a #GskGLShader
* @args: uniform arguments
* @idx: index of the uniform
*
* Gets the value of the uniform @idx in the @args block.
* The uniform must be of uint type.
@@ -802,7 +816,7 @@ gsk_gl_shader_get_arg_int (GskGLShader *shader,
*/
guint32
gsk_gl_shader_get_arg_uint (GskGLShader *shader,
GBytes *args,
GBytes *args,
int idx)
{
const GskGLUniform *u;
@@ -823,9 +837,9 @@ gsk_gl_shader_get_arg_uint (GskGLShader *shader,
/**
* gsk_gl_shader_get_arg_bool:
* @shader: A #GskGLShader
* @args: The uniform arguments
* @idx: The index of the uniform
* @shader: a #GskGLShader
* @args: uniform arguments
* @idx: index of the uniform
*
* Gets the value of the uniform @idx in the @args block.
* The uniform must be of bool type.
@@ -834,7 +848,7 @@ gsk_gl_shader_get_arg_uint (GskGLShader *shader,
*/
gboolean
gsk_gl_shader_get_arg_bool (GskGLShader *shader,
GBytes *args,
GBytes *args,
int idx)
{
const GskGLUniform *u;
@@ -855,19 +869,19 @@ gsk_gl_shader_get_arg_bool (GskGLShader *shader,
/**
* gsk_gl_shader_get_arg_vec2:
* @shader: A #GskGLShader
* @args: The uniform arguments
* @idx: The index of the uniform
* @out_value: Location to store set the uniform value too
* @shader: a #GskGLShader
* @args: uniform arguments
* @idx: index of the uniform
* @out_value: location to store the uniform value in
*
* Gets the value of the uniform @idx in the @args block.
* The uniform must be of vec2 type.
*/
void
gsk_gl_shader_get_arg_vec2 (GskGLShader *shader,
GBytes *args,
int idx,
graphene_vec2_t *out_value)
gsk_gl_shader_get_arg_vec2 (GskGLShader *shader,
GBytes *args,
int idx,
graphene_vec2_t *out_value)
{
const GskGLUniform *u;
const guchar *args_src;
@@ -887,19 +901,19 @@ gsk_gl_shader_get_arg_vec2 (GskGLShader *shader,
/**
* gsk_gl_shader_get_arg_vec3:
* @shader: A #GskGLShader
* @args: The uniform arguments
* @idx: The index of the uniform
* @out_value: Location to store set the uniform value too
* @shader: a #GskGLShader
* @args: uniform arguments
* @idx: index of the uniform
* @out_value: location to store the uniform value in
*
* Gets the value of the uniform @idx in the @args block.
* The uniform must be of vec3 type.
*/
void
gsk_gl_shader_get_arg_vec3 (GskGLShader *shader,
GBytes *args,
int idx,
graphene_vec3_t *out_value)
gsk_gl_shader_get_arg_vec3 (GskGLShader *shader,
GBytes *args,
int idx,
graphene_vec3_t *out_value)
{
const GskGLUniform *u;
const guchar *args_src;
@@ -919,19 +933,19 @@ gsk_gl_shader_get_arg_vec3 (GskGLShader *shader,
/**
* gsk_gl_shader_get_arg_vec4:
* @shader: A #GskGLShader
* @args: The uniform arguments
* @idx: The index of the uniform
* @out_value: Location to store set the uniform value too
* @shader: a #GskGLShader
* @args: uniform arguments
* @idx: index of the uniform
* @out_value: location to store set the uniform value in
*
* Gets the value of the uniform @idx in the @args block.
* The uniform must be of vec4 type.
*/
void
gsk_gl_shader_get_arg_vec4 (GskGLShader *shader,
GBytes *args,
int idx,
graphene_vec4_t *out_value)
gsk_gl_shader_get_arg_vec4 (GskGLShader *shader,
GBytes *args,
int idx,
graphene_vec4_t *out_value)
{
const GskGLUniform *u;
const guchar *args_src;
@@ -951,12 +965,12 @@ gsk_gl_shader_get_arg_vec4 (GskGLShader *shader,
/**
* gsk_gl_shader_format_args_va:
* @shader: A #GskGLShader
* @uniforms: Name-Value pairs for the uniforms of @shader, ending with a
* %NULL name, all values are passed by reference.
* @shader: a #GskGLShader
* @uniforms: name-Value pairs for the uniforms of @shader, ending
* with a %NULL name
*
* Formats the uniform data as needed for feeding the named uniforms
* values into the shader. The argument list is a list of pairs of
* values into the shader. The argument list is a list of pairs of
* names, and values for the types that match the declared uniforms
* (i.e. double/int/guint/gboolean for primitive values and
* `graphene_vecN_t *` for vecN uniforms).
@@ -992,9 +1006,6 @@ gsk_gl_shader_format_args_va (GskGLShader *shader,
args_dest = args + u->offset;
/* We use pointers-to-value so that all values are the same
size, otherwise we couldn't handle the missing uniform case above */
switch (u->type)
{
case GSK_GL_UNIFORM_TYPE_FLOAT:
@@ -1039,9 +1050,9 @@ gsk_gl_shader_format_args_va (GskGLShader *shader,
/**
* gsk_gl_shader_format_args:
* @shader: A #GskGLShader
* @...: Name-Value pairs for the uniforms of @shader, ending with a %NULL
* name, all values are passed by reference.
* @shader: a #GskGLShader
* @...: name-Value pairs for the uniforms of @shader, ending with
* a %NULL name
*
* Formats the uniform data as needed for feeding the named uniforms
* values into the shader. The argument list is a list of pairs of
@@ -1082,7 +1093,7 @@ G_DEFINE_BOXED_TYPE (GskShaderArgsBuilder, gsk_shader_args_builder,
/**
* gsk_gl_shader_build_args:
* @shader: A #GskGLShader
* @shader: a #GskGLShader
* @initial_values: (nullable): optional #Bytes with initial values
*
* Allocates a builder that can be used to construct a new uniform data
@@ -1114,7 +1125,7 @@ gsk_shader_args_builder_new (GskGLShader *shader,
/**
* gsk_shader_args_builder_to_args:
* @builder: A #GskShaderArgsBuilder
* @builder: a #GskShaderArgsBuilder
*
* Creates a new #GBytes args from the current state of the
* given @builder. Any uniforms of the shader that have not
@@ -1127,7 +1138,7 @@ gsk_shader_args_builder_new (GskGLShader *shader,
* gsk_shader_args_builder_free_to_args().
*
*
* Returns: (transfer full): The newly allocated builder, free with
* Returns: (transfer full): the newly allocated builder, free with
* gsk_shader_args_builder_free()
*/
GBytes *
@@ -1166,7 +1177,7 @@ gsk_shader_args_builder_free_to_args (GskShaderArgsBuilder *builder)
/**
* gsk_shader_args_builder_unref:
* @builder: A #GskShaderArgsBuilder
* @builder: a #GskShaderArgsBuilder
*
* Decreases the reference count of a #GskShaderArgBuilder by one.
* If the resulting reference count is zero, frees the builder.
@@ -1189,11 +1200,11 @@ gsk_shader_args_builder_unref (GskShaderArgsBuilder *builder)
/**
* gsk_shader_args_builder_ref:
* @builder: A #GskShaderArgsBuilder
* @builder: a #GskShaderArgsBuilder
*
* Increases the reference count of a #GskShaderArgsBuilder by one.
*
* Returns: the passed in #GskShaderArgsBuilder.
* Returns: the passed in #GskShaderArgsBuilder
*/
GskShaderArgsBuilder *
gsk_shader_args_builder_ref (GskShaderArgsBuilder *builder)
@@ -1206,17 +1217,17 @@ gsk_shader_args_builder_ref (GskShaderArgsBuilder *builder)
/**
* gsk_shader_args_builder_set_float:
* @builder: A #GskShaderArgsBuilder
* @idx: The index of the uniform
* @value: The value to set the uniform too
* @builder: a #GskShaderArgsBuilder
* @idx: index of the uniform
* @value: value to set the uniform to
*
* Sets the value of the uniform @idx.
* The uniform must be of float type.
*/
void
gsk_shader_args_builder_set_float (GskShaderArgsBuilder *builder,
int idx,
float value)
int idx,
float value)
{
GskGLShader *shader = builder->shader;
const GskGLUniform *u;
@@ -1233,17 +1244,17 @@ gsk_shader_args_builder_set_float (GskShaderArgsBuilder *builder,
/**
* gsk_shader_args_builder_set_int:
* @builder: A #GskShaderArgsBuilder
* @idx: The index of the uniform
* @value: The value to set the uniform too
* @builder: a #GskShaderArgsBuilder
* @idx: index of the uniform
* @value: value to set the uniform to
*
* Sets the value of the uniform @idx.
* The uniform must be of int type.
*/
void
gsk_shader_args_builder_set_int (GskShaderArgsBuilder *builder,
int idx,
gint32 value)
int idx,
gint32 value)
{
GskGLShader *shader = builder->shader;
const GskGLUniform *u;
@@ -1260,17 +1271,17 @@ gsk_shader_args_builder_set_int (GskShaderArgsBuilder *builder,
/**
* gsk_shader_args_builder_set_uint:
* @builder: A #GskShaderArgsBuilder
* @idx: The index of the uniform
* @value: The value to set the uniform too
* @builder: a #GskShaderArgsBuilder
* @idx: index of the uniform
* @value: value to set the uniform to
*
* Sets the value of the uniform @idx.
* The uniform must be of uint type.
*/
void
gsk_shader_args_builder_set_uint (GskShaderArgsBuilder *builder,
int idx,
guint32 value)
int idx,
guint32 value)
{
GskGLShader *shader = builder->shader;
const GskGLUniform *u;
@@ -1287,17 +1298,17 @@ gsk_shader_args_builder_set_uint (GskShaderArgsBuilder *builder,
/**
* gsk_shader_args_builder_set_bool:
* @builder: A #GskShaderArgsBuilder
* @idx: The index of the uniform
* @value: The value to set the uniform too
* @builder: a #GskShaderArgsBuilder
* @idx: index of the uniform
* @value: value to set the uniform to
*
* Sets the value of the uniform @idx.
* The uniform must be of bool type.
*/
void
gsk_shader_args_builder_set_bool (GskShaderArgsBuilder *builder,
int idx,
gboolean value)
int idx,
gboolean value)
{
GskGLShader *shader = builder->shader;
const GskGLUniform *u;
@@ -1315,14 +1326,14 @@ gsk_shader_args_builder_set_bool (GskShaderArgsBuilder *builder,
/**
* gsk_shader_args_builder_set_vec2:
* @builder: A #GskShaderArgsBuilder
* @idx: The index of the uniform
* @value: The value to set the uniform too
* @idx: index of the uniform
* @value: value to set the uniform too
*
* Sets the value of the uniform @idx.
* The uniform must be of vec2 type.
*/
void
gsk_shader_args_builder_set_vec2 (GskShaderArgsBuilder *builder,
gsk_shader_args_builder_set_vec2 (GskShaderArgsBuilder *builder,
int idx,
const graphene_vec2_t *value)
{
@@ -1341,15 +1352,15 @@ gsk_shader_args_builder_set_vec2 (GskShaderArgsBuilder *builder,
/**
* gsk_shader_args_builder_set_vec3:
* @builder: A #GskShaderArgsBuilder
* @idx: The index of the uniform
* @value: The value to set the uniform too
* @builder: a #GskShaderArgsBuilder
* @idx: index of the uniform
* @value: value to set the uniform too
*
* Sets the value of the uniform @idx.
* The uniform must be of vec3 type.
*/
void
gsk_shader_args_builder_set_vec3 (GskShaderArgsBuilder *builder,
gsk_shader_args_builder_set_vec3 (GskShaderArgsBuilder *builder,
int idx,
const graphene_vec3_t *value)
{
@@ -1368,15 +1379,15 @@ gsk_shader_args_builder_set_vec3 (GskShaderArgsBuilder *builder,
/**
* gsk_shader_args_builder_set_vec4:
* @builder: A #GskShaderArgsBuilder
* @idx: The index of the uniform
* @value: The value to set the uniform too
* @builder: a #GskShaderArgsBuilder
* @idx: index of the uniform
* @value: value to set the uniform too
*
* Sets the value of the uniform @idx.
* The uniform must be of vec4 type.
*/
void
gsk_shader_args_builder_set_vec4 (GskShaderArgsBuilder *builder,
gsk_shader_args_builder_set_vec4 (GskShaderArgsBuilder *builder,
int idx,
const graphene_vec4_t *value)
{

10
gsk/gskglshader.h
View File

@@ -57,18 +57,18 @@ GDK_AVAILABLE_IN_ALL
int gsk_gl_shader_get_n_uniforms (GskGLShader *shader);
GDK_AVAILABLE_IN_ALL
const char * gsk_gl_shader_get_uniform_name (GskGLShader *shader,
int idx);
int idx);
GDK_AVAILABLE_IN_ALL
int gsk_gl_shader_find_uniform_by_name (GskGLShader *shader,
const char *name);
const char *name);
GDK_AVAILABLE_IN_ALL
GskGLUniformType gsk_gl_shader_get_uniform_type (GskGLShader *shader,
int idx);
int idx);
GDK_AVAILABLE_IN_ALL
int gsk_gl_shader_get_uniform_offset (GskGLShader *shader,
int idx);
int idx);
GDK_AVAILABLE_IN_ALL
gsize gsk_gl_shader_get_args_size (GskGLShader *shader);
gsize gsk_gl_shader_get_args_size (GskGLShader *shader);
/* Helpers for managing shader args */