/**
* Given a set of flags, determine whether a shader with these flags exists within the GL_shader vector. If no shader with the requested flags exists, attempt to compile one.
*
* @param shader_t shader_type variable, a reference to the shader program needed
* @param flags Integer variable, holding a combination of SDR_* flags
* @return Index into GL_shader, referencing a valid shader, or -1 if shader compilation failed
*/
int gr_opengl_maybe_create_shader(shader_type shader_t, unsigned int flags)
{
size_t idx = opengl_get_shader_idx(shader_t, flags);
if (idx < GL_shader.size())
return (int)idx;
// If we are here, it means we need to compile a new shader
return opengl_compile_shader(shader_t, flags);
}
/**
* Given a set of flags, determine whether a shader with these flags exists within the GL_shader vector. If no shader with the requested flags exists, attempt to compile one.
*
* @param shader_t shader_type variable, a reference to the shader program needed
* @param flags Integer variable, holding a combination of SDR_* flags
* @return Index into GL_shader, referencing a valid shader, or -1 if shader compilation failed
*/
int gr_opengl_maybe_create_shader(shader_type shader_t, unsigned int flags)
{
size_t idx;
size_t max = GL_shader.size();
for (idx = 0; idx < max; idx++) {
if (GL_shader[idx].shader == shader_t && GL_shader[idx].flags == flags) {
return (int)idx;
}
}
// If we are here, it means we need to compile a new shader
return opengl_compile_shader(shader_t, flags);
}
int opengl_shader_binary_generator(const GLchar ** opengl_vertex_source,
const GLchar ** opengl_fragment_source,
const GLchar ** opengl_tessellation_control_source,
const GLchar ** opengl_tessellation_evaluation_source,
const GLchar ** opengl_geometry_source, const char *outputfile)
{
int i;
void *bin_buffer;
FILE *f;
GLuint opengl_vertex_shader_id = 0;
GLuint opengl_tessellation_control_shader_id = 0;
GLuint opengl_tessellation_evaluation_shader_id = 0;
GLuint opengl_geometry_shader_id = 0;
GLuint opengl_fragment_shader_id = 0;
GLint status;
GLint formats;
GLint logLen;
GLsizei written;
GLint bin_length;
if (!opengl_vertex_source || !opengl_fragment_source)
return -1;
/* Compile shaders */
opengl_vertex_shader_id =
opengl_compile_shader(opengl_vertex_source, GL_VERTEX_SHADER);
if (opengl_tessellation_control_source)
opengl_tessellation_control_shader_id =
opengl_compile_shader
(opengl_tessellation_control_source,
GL_TESS_CONTROL_SHADER);
if (opengl_tessellation_evaluation_source)
opengl_tessellation_evaluation_shader_id =
opengl_compile_shader
(opengl_tessellation_evaluation_source,
GL_TESS_EVALUATION_SHADER);
if (opengl_geometry_source)
opengl_geometry_shader_id =
opengl_compile_shader(opengl_geometry_source,
GL_GEOMETRY_SHADER);
opengl_fragment_shader_id =
opengl_compile_shader(opengl_fragment_source,
GL_FRAGMENT_SHADER);
/* Create GL program */
GLuint glprogram = glCreateProgram();
if (glprogram == 0)
{
fprintf(stderr, "Error creating program object.\n");
exit(1);
}
/* Attach shaders to program */
glAttachShader(glprogram, opengl_vertex_shader_id);
if (opengl_tessellation_control_shader_id != 0)
glAttachShader(glprogram,
opengl_tessellation_control_shader_id);
if (opengl_tessellation_evaluation_shader_id != 0)
glAttachShader(glprogram,
opengl_tessellation_evaluation_shader_id);
if (opengl_geometry_shader_id != 0)
glAttachShader(glprogram, opengl_geometry_shader_id);
glAttachShader(glprogram, opengl_fragment_shader_id);
/* Link */
glProgramParameteri(glprogram, PROGRAM_BINARY_RETRIEVABLE_HINT,
GL_TRUE);
glLinkProgram(glprogram);
glGetProgramiv(glprogram, GL_LINK_STATUS, &status);
if (status == GL_FALSE)
{
fprintf(stderr, "Failed to link shader program!\n");
glGetProgramiv(glprogram, GL_INFO_LOG_LENGTH, &logLen);
if (logLen > 0)
{
char *log = (char *) xmalloc(logLen);
glGetProgramInfoLog(glprogram, logLen, &written, log);
fprintf(stderr, "Program log: \n%s", log);
free(log);
exit(1);
}
}
else
glUseProgram(glprogram);
/* Dump binary */
glGetIntegerv(GL_NUM_PROGRAM_BINARY_FORMATS, &formats);
GLint *binaryFormats = xcalloc(formats, sizeof(GLint));
glGetIntegerv(GL_PROGRAM_BINARY_FORMATS, binaryFormats);
for (i = 0; i < formats; i++)
printf("Format[%d]=%d\n", i, binaryFormats[i]);
glGetProgramiv(glprogram, GL_PROGRAM_BINARY_LENGTH, &bin_length);
printf("Shader binary has %d bytes\n", bin_length);
bin_buffer = xmalloc(bin_length);
f = fopen(outputfile, "wb");
fwrite(bin_buffer, bin_length, 1, f);
fclose(f);
/* Process generated binary */
if (dump_intermediate)
opengl_shader_binary_analyze(outputfile);
free(bin_buffer);
return 0;
}