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Move the cogl shader boilerplate setting code to a separate function

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_cogl_shader_compile_real had some code to create a set of strings to
combine the boilerplate code with a shader before calling
glShaderSource. This has now been moved to its own internal function
so that it could be used from the GLSL pipeline backend as well.
This commit is contained in:
Neil Roberts 2010-11-22 12:15:35 +00:00
parent 339fc68bcb
commit 6246c2bd6c
2 changed files with 84 additions and 24 deletions
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8
clutter/cogl/cogl/cogl-shader-private.h
View File

@ -54,4 +54,12 @@ _cogl_shader_compile_real (CoglHandle handle, int n_tex_coord_attribs);
CoglShaderLanguage
_cogl_program_get_language (CoglHandle handle);
void
_cogl_shader_set_source_with_boilerplate (GLuint shader_gl_handle,
GLenum shader_gl_type,
int n_tex_coord_attribs,
GLsizei count_in,
const char **strings_in,
const GLint *lengths_in);
#endif /* __COGL_SHADER_H */

100
clutter/cogl/cogl/cogl-shader.c
View File

@ -183,6 +183,72 @@ cogl_shader_compile (CoglHandle handle)
* replace it with a pipeline snippets API. */
}
void
_cogl_shader_set_source_with_boilerplate (GLuint shader_gl_handle,
GLenum shader_gl_type,
int n_tex_coord_attribs,
GLsizei count_in,
const char **strings_in,
const GLint *lengths_in)
{
static const char common_boilerplate[] = _COGL_COMMON_SHADER_BOILERPLATE;
static const char vertex_boilerplate[] = _COGL_VERTEX_SHADER_BOILERPLATE;
static const char fragment_boilerplate[] = _COGL_FRAGMENT_SHADER_BOILERPLATE;
const char **strings = g_alloca (sizeof (char *) * (count_in + 3));
GLint *lengths = g_alloca (sizeof (GLint) * (count_in + 3));
int count = 0;
#ifdef HAVE_COGL_GLES2
char *tex_coords_declaration = NULL;
#endif
GET_CONTEXT (ctx, NO_RETVAL);
strings[count] = common_boilerplate;
lengths[count++] = sizeof (common_boilerplate) - 1;
if (shader_gl_type == GL_VERTEX_SHADER)
{
strings[count] = vertex_boilerplate;
lengths[count++] = sizeof (vertex_boilerplate) - 1;
}
else if (shader_gl_type == GL_FRAGMENT_SHADER)
{
strings[count] = fragment_boilerplate;
lengths[count++] = sizeof (fragment_boilerplate) - 1;
}
#ifdef HAVE_COGL_GLES2
if (n_tex_coord_attribs)
{
tex_coords_declaration =
g_strdup_printf ("varying vec2 _cogl_tex_coord[%d];\n",
n_tex_coord_attribs);
strings[count] = tex_coords_declaration;
lengths[count++] = -1; /* null terminated */
}
#endif
memcpy (strings + count, strings_in, sizeof (char *) * count_in);
if (lengths_in)
memcpy (lengths + count, lengths_in, sizeof (GLint) * count_in);
else
{
int i;
for (i = 0; i < count_in; i++)
lengths[count + i] = -1; /* null terminated */
}
count += count_in;
GE( glShaderSource (shader_gl_handle, count,
(const char **) strings, lengths) );
#ifdef HAVE_COGL_GLES2
g_free (tex_coords_declaration);
#endif
}
void
_cogl_shader_compile_real (CoglHandle handle,
int n_tex_coord_attribs)
@ -228,8 +294,6 @@ _cogl_shader_compile_real (CoglHandle handle,
else
#endif
{
char *sourcev[4];
int count = 0;
GLenum gl_type;
if (shader->gl_handle
@ -257,31 +321,19 @@ _cogl_shader_compile_real (CoglHandle handle,
shader->gl_handle = glCreateShader (gl_type);
sourcev[count++] = _COGL_COMMON_SHADER_BOILERPLATE;
if (shader->type == COGL_SHADER_TYPE_VERTEX)
sourcev[count++] = _COGL_VERTEX_SHADER_BOILERPLATE;
else
sourcev[count++] = _COGL_FRAGMENT_SHADER_BOILERPLATE;
#ifdef HAVE_COGL_GLES2
if (n_tex_coord_attribs)
sourcev[count++] =
g_strdup_printf ("varying vec2 _cogl_tex_coord[%d];\n",
n_tex_coord_attribs);
shader->n_tex_coord_attribs = n_tex_coord_attribs;
#endif
sourcev[count++] = shader->source;
glShaderSource (shader->gl_handle, count, (const char **)sourcev, NULL);
#ifdef HAVE_COGL_GLES2
if (count == 4)
g_free (sourcev[2]);
#endif
_cogl_shader_set_source_with_boilerplate (shader->gl_handle,
gl_type,
n_tex_coord_attribs,
1,
(const char **) &shader->source,
NULL);
GE (glCompileShader (shader->gl_handle));
#ifdef HAVE_COGL_GLES2
shader->n_tex_coord_attribs = n_tex_coord_attribs;
#endif
#ifdef COGL_GL_DEBUG
if (!cogl_shader_is_compiled (handle))
{