opengl-program: Allow loading from file
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c2e8301243
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@ -16,6 +16,8 @@
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#include <shimatta-opengl-program.h>
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#include <epoxy/gl.h>
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#include <stdio.h>
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#include <stdlib.h>
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struct _ShimattaOpenglProgram {
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GObject super;
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@ -149,12 +151,44 @@ gboolean shimatta_opengl_program_is_compiled(ShimattaOpenglProgram *program)
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return priv->compiled;
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}
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static char *load_shader_from_source_file(const char *src_file)
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/**
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* @brief This function loads the entire content of a file into a zero-terminated string
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* @param src_file Path to the source file
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* @return Newly created buffer containing file content. NULL in case of an error.
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* @note The returend buffer has to be deleted by the caller using g_free()
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*/
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static gchar *load_shader_from_source_file(const char *src_file)
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{
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FILE *fil;
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long int end_position;
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gchar *file_content;
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if (!src_file)
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return NULL;
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fil = fopen(src_file, "rb");
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if (!fil) {
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g_warning("Shader source file not found: %s", src_file);
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return NULL;
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}
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static int compile_shader(const char *src, char *error_text, size_t error_text_size, gboolean use_error,
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/* Get length of file */
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fseek(fil, 0, SEEK_END);
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end_position = ftell(fil);
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fseek(fil, 0, SEEK_SET);
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/* Allocate memory for file content */
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file_content = (gchar *)g_malloc(end_position + 1);
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fread(file_content, 1, end_position, fil);
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fclose(fil);
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/* Append null terminator */
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file_content[end_position] = '\0';
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return file_content;
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}
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static int compile_shader(const gchar *src, char *error_text, size_t error_text_size, gboolean use_error,
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GLuint shader_type, GLuint *shader_id_out)
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{
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GLuint shader_id;
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@ -186,7 +220,7 @@ int shimatta_opengl_program_compile(ShimattaOpenglProgram *program, char *error_
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{
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gboolean use_error = FALSE;
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ShimattaOpenglProgramPrivate *priv;
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char *shader_source_code;
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gchar *shader_source_code;
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int ret_val = 0;
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int status;
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GLint success;
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@ -224,7 +258,7 @@ int shimatta_opengl_program_compile(ShimattaOpenglProgram *program, char *error_
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status = compile_shader(shader_source_code, error_text, error_text_size, use_error, GL_VERTEX_SHADER,
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&vertex_shader);
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free(shader_source_code);
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g_free(shader_source_code);
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if (status) {
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ret_val = -2;
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@ -251,7 +285,7 @@ int shimatta_opengl_program_compile(ShimattaOpenglProgram *program, char *error_
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status = compile_shader(shader_source_code, error_text, error_text_size, use_error, GL_FRAGMENT_SHADER,
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&fragment_shader);
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free(shader_source_code);
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g_free(shader_source_code);
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if (status) {
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ret_val = -2;
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@ -278,7 +312,7 @@ int shimatta_opengl_program_compile(ShimattaOpenglProgram *program, char *error_
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status = compile_shader(shader_source_code, error_text, error_text_size, use_error, GL_GEOMETRY_SHADER,
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&geometry_shader);
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free(shader_source_code);
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g_free(shader_source_code);
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if (status) {
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ret_val = -2;
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