X-Git-Url: http://git.mutantstargoat.com/user/nuclear/?p=demo_prior;a=blobdiff_plain;f=src%2Ftexture.c;fp=src%2Ftexture.c;h=c0a80b2cb80fb3c833a35f3327430a6178890fbd;hp=0000000000000000000000000000000000000000;hb=3a9f6854df479d81442273c9d0b133c49c5c8f66;hpb=0b24071f728b7c8550daa1b7aa7c4012cb70ef4c

diff --git a/src/texture.c b/src/texture.c
new file mode 100644
index 0000000..c0a80b2
--- /dev/null
+++ b/src/texture.c
@@ -0,0 +1,64 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include "opengl.h"
+#include "texture.h"
+#include "imago2.h"
+#include "opt.h"
+
+static unsigned int gl_ifmt[2][NUM_IMG_FMT] = {
+	/* opt.srgb == 0 */
+	{GL_LUMINANCE, GL_RGB, GL_RGBA, GL_LUMINANCE16F_ARB, GL_RGB16F, GL_RGBA16F, GL_RGBA, GL_RGB},
+	/* opt.srgb == 1 */
+	{GL_SLUMINANCE, GL_SRGB, GL_SRGB_ALPHA, GL_LUMINANCE16F_ARB, GL_RGB16F, GL_RGBA16F, GL_SRGB_ALPHA, GL_SRGB}
+};
+static unsigned int gl_fmt[] = {
+	GL_LUMINANCE, GL_RGB, GL_RGBA, GL_LUMINANCE, GL_RGB, GL_RGBA, GL_BGRA, GL_RGB
+};
+static unsigned int gl_type[] = {
+	GL_UNSIGNED_BYTE, GL_UNSIGNED_BYTE, GL_UNSIGNED_BYTE, GL_FLOAT, GL_FLOAT, GL_FLOAT, GL_UNSIGNED_BYTE, GL_UNSIGNED_SHORT_5_6_5
+};
+
+struct texture *load_texture(const char *fname)
+{
+	struct img_pixmap img;
+	struct texture *tex;
+	int ifmt;
+
+	img_init(&img);
+	if(img_load(&img, fname) == -1) {
+		fprintf(stderr, "failed to load texture: %s\n", fname);
+		return 0;
+	}
+	ifmt = gl_ifmt[opt.srgb][img.fmt];
+
+	if(!(tex = malloc(sizeof *tex))) {
+		img_destroy(&img);
+		fprintf(stderr, "failed to allocate texture\n");
+		return 0;
+	}
+
+	glGenTextures(1, &tex->id);
+	glBindTexture(GL_TEXTURE_2D, tex->id);
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+	glTexParameteri(GL_TEXTURE_2D, GL_GENERATE_MIPMAP_SGIS, 1);
+	glTexImage2D(GL_TEXTURE_2D, 0, ifmt, img.width, img.height, 0, gl_fmt[img.fmt],
+			gl_type[img.fmt], img.pixels);
+
+	tex->width = img.width;
+	tex->height = img.height;
+	tex->pixels = img.pixels;
+	return tex;
+}
+
+void free_texture(struct texture *tex)
+{
+	if(!tex) return;
+
+	if(tex->id) {
+		glDeleteTextures(1, &tex->id);
+	}
+
+	free(tex->pixels);
+	free(tex);
+}