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opengl: fix for shaders with version directive

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If a shaderfile contains a version directive, use that instead of default.
This commit is contained in:
ts-korhonen
2021-12-05 02:05:52 +02:00
parent 8b2bb6eb04
commit 5af55a9cf8
1 changed files with 34 additions and 4 deletions
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38
src/win/win_opengl_glslp.c
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@@ -173,17 +173,47 @@ GLuint load_custom_shaders(const char* path)
{
int success = 1;
const char* vertex_sources[2] = { "#version 130\n#define VERTEX\n", shader };
const char* fragment_sources[2] = { "#version 130\n#define FRAGMENT\n", shader };
const char* vertex_sources[3] = { "#version 130\n", "#define VERTEX\n", shader };
const char* fragment_sources[3] = { "#version 130\n", "#define FRAGMENT\n", shader };
/* Check if the shader program defines version directive */
char* version_start = strstr(shader, "#version");
/* If the shader program contains a version directive,
it must be captured and placed as the first statement. */
if (version_start != NULL)
{
/* Version directive found, search the line end */
char* version_end = strchr(version_start, '\n');
if (version_end != NULL)
{
char version[30];
size_t version_len = MIN(version_end - version_start + 1, 29);
memcpy(version, version_start, version_len);
version[version_len] = 0; /* string null terminator */
/* replace the default version directive */
vertex_sources[0] = version;
fragment_sources[0] = version;
}
/* Comment out the original version directive
as only one is allowed. */
memset(version_start, '/', 2);
}
GLuint vertex_id = glCreateShader(GL_VERTEX_SHADER);
GLuint fragment_id = glCreateShader(GL_FRAGMENT_SHADER);
glShaderSource(vertex_id, 2, vertex_sources, NULL);
glShaderSource(vertex_id, 3, vertex_sources, NULL);
glCompileShader(vertex_id);
success *= check_status(vertex_id, OPENGL_BUILD_TARGET_VERTEX, path);
glShaderSource(fragment_id, 2, fragment_sources, NULL);
glShaderSource(fragment_id, 3, fragment_sources, NULL);
glCompileShader(fragment_id);
success *= check_status(fragment_id, OPENGL_BUILD_TARGET_FRAGMENT, path);