dxt_util.h File Reference

#include "dxt_common.h"
#include <GL/glew.h>
#include <GL/gl.h>
#include <string.h>

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Functions
static int	dxt_get_size (int width, int height, enum dxt_type format)
GLuint	dxt_shader_create_from_file (const char *filename, GLenum type)
GLuint	dxt_shader_create_from_source (const char *source, GLenum type)

Function Documentation

dxt_get_size()

static int dxt_get_size ( int width, int height, enum dxt_type format )

inlinestatic

Copyright (c) 2011, Martin Srom All rights reserved.

Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:

* Redistributions of source code must retain the above copyright
  notice, this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright
  notice, this list of conditions and the following disclaimer in the
  documentation and/or other materials provided with the distribution.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

Definition at line 60 of file dxt_util.h.

{
    assert( format == DXT_TYPE_DXT5_YCOCG || format == DXT_TYPE_DXT1 ||  format == DXT_TYPE_DXT1_YUV );
 
    if ( format == DXT_TYPE_DXT5_YCOCG )
        return ((width + 3) / 4 * 4) * ((height + 3) / 4 * 4);
    else
        return ((width + 3) / 4 * 4) * ((height + 3) / 4 * 4) / 2;
}

References DXT_TYPE_DXT1, DXT_TYPE_DXT1_YUV, and DXT_TYPE_DXT5_YCOCG.

Referenced by configure_with().

dxt_shader_create_from_file()

GLuint dxt_shader_create_from_file	(	const char *	filename,
		GLenum	type )

Create shader from file

Parameters

filename	Shade source filename
type	Shader type

Returns

shader handle if succeeds, otherwise zero

Documented at declaration

Definition at line 56 of file dxt_util.c.

{    
    // Load program from file
    FILE* file;
        file = fopen(filename, "r");
        if ( !file ) {
                fprintf(stderr, "Failed open %s for reading!\n", filename);
                return 0;
        }
    fseek(file, 0, SEEK_END);
    int data_size = ftell(file);
    assert(data_size >= 0);
    rewind(file);
    char* program = (char*)malloc((data_size  + 1) * sizeof(char));
    if ( (size_t) data_size != fread(program, sizeof(char), data_size, file) ) {
        fprintf(stderr, "Failed to load program [%d bytes] from file %s!\n", data_size, filename);
        free(program);
        fclose(file);
        return 0;
    }
    fclose(file);
    program[data_size] = '\0';
 
    printf("Compiling program [%s]...\n", filename);
    GLuint shader =  dxt_shader_create_from_source(program, type);
    if ( shader == 0 ) {
        free(program);
        return 0;
    }
    
    free(program);
    
    return shader;
}

References dxt_shader_create_from_source(), and type.

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dxt_shader_create_from_source()

GLuint dxt_shader_create_from_source	(	const char *	source,
		GLenum	type )

Create shader from source

Parameters

source	Shade source
type	Shader type

Returns

shader handle if succeeds, otherwise zero

Copyright (c) 2011, Martin Srom All rights reserved.

Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:

* Redistributions of source code must retain the above copyright
  notice, this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright
  notice, this list of conditions and the following disclaimer in the
  documentation and/or other materials provided with the distribution.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. Documented at declaration

Definition at line 32 of file dxt_util.c.

{
    // Create shader
    GLuint shader = glCreateShader(type);
    
    // Compile shader source
    glShaderSource(shader, 1, (const GLchar**)&source, NULL);
    glCompileShader(shader);    
    
    // Check result
    GLint status;
    glGetShaderiv(shader, GL_COMPILE_STATUS, &status);
    if ( status == GL_FALSE ) {
        char log[32768];
        glGetShaderInfoLog(shader, 32768, NULL, (GLchar*)log);
        printf("Shader Compilation Failed : %s\n", log);
        return 0;
    }
    
    return shader;
}

References type.

Referenced by dxt_decoder_create(), dxt_display_init(), dxt_encoder_create(), dxt_prepare_yuv422_shader(), and dxt_shader_create_from_file().