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opengl-program: Allow loading from file

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This commit is contained in:
Mario Hüttel
2020-06-27 19:21:22 +02:00
parent c2e8301243
commit 8837de9e2a
1 changed files with 40 additions and 6 deletions
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46
src/shimatta-opengl-program.c
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@@ -16,6 +16,8 @@
#include <shimatta-opengl-program.h>
#include <epoxy/gl.h>
#include <stdio.h>
#include <stdlib.h>
struct _ShimattaOpenglProgram {
GObject super;
@@ -149,12 +151,44 @@ gboolean shimatta_opengl_program_is_compiled(ShimattaOpenglProgram *program)
return priv->compiled;
}
static char *load_shader_from_source_file(const char *src_file)
/**
* @brief This function loads the entire content of a file into a zero-terminated string
* @param src_file Path to the source file
* @return Newly created buffer containing file content. NULL in case of an error.
* @note The returend buffer has to be deleted by the caller using g_free()
*/
static gchar *load_shader_from_source_file(const char *src_file)
{
FILE *fil;
long int end_position;
gchar *file_content;
if (!src_file)
return NULL;
fil = fopen(src_file, "rb");
if (!fil) {
g_warning("Shader source file not found: %s", src_file);
return NULL;
}
/* Get length of file */
fseek(fil, 0, SEEK_END);
end_position = ftell(fil);
fseek(fil, 0, SEEK_SET);
/* Allocate memory for file content */
file_content = (gchar *)g_malloc(end_position + 1);
fread(file_content, 1, end_position, fil);
fclose(fil);
/* Append null terminator */
file_content[end_position] = '\0';
return file_content;
}
static int compile_shader(const char *src, char *error_text, size_t error_text_size, gboolean use_error,
static int compile_shader(const gchar *src, char *error_text, size_t error_text_size, gboolean use_error,
GLuint shader_type, GLuint *shader_id_out)
{
GLuint shader_id;
@@ -186,7 +220,7 @@ int shimatta_opengl_program_compile(ShimattaOpenglProgram *program, char *error_
{
gboolean use_error = FALSE;
ShimattaOpenglProgramPrivate *priv;
char *shader_source_code;
gchar *shader_source_code;
int ret_val = 0;
int status;
GLint success;
@@ -224,7 +258,7 @@ int shimatta_opengl_program_compile(ShimattaOpenglProgram *program, char *error_
status = compile_shader(shader_source_code, error_text, error_text_size, use_error, GL_VERTEX_SHADER,
&vertex_shader);
free(shader_source_code);
g_free(shader_source_code);
if (status) {
ret_val = -2;
@@ -251,7 +285,7 @@ int shimatta_opengl_program_compile(ShimattaOpenglProgram *program, char *error_
status = compile_shader(shader_source_code, error_text, error_text_size, use_error, GL_FRAGMENT_SHADER,
&fragment_shader);
free(shader_source_code);
g_free(shader_source_code);
if (status) {
ret_val = -2;
@@ -278,7 +312,7 @@ int shimatta_opengl_program_compile(ShimattaOpenglProgram *program, char *error_
status = compile_shader(shader_source_code, error_text, error_text_size, use_error, GL_GEOMETRY_SHADER,
&geometry_shader);
free(shader_source_code);
g_free(shader_source_code);
if (status) {
ret_val = -2;