graphics

commit 43369cceed992f722cccbf4a47eed54f65ec6151
parent a7d20d40f0862f7b2440904683864b40e2607c1e
Author: Brian Swetland <swetland@frotz.net>
Date:   Thu, 12 Sep 2013 21:22:33 -0700

texture2d: provide createRGBA() to create an empty texture

Diffstat:
M
common/buffers.cc
 | 
13
+++++++++++++
M
common/core.h
 | 
1
+

2 files changed, 14 insertions(+), 0 deletions(-)
diff --git a/common/buffers.cc b/common/buffers.cc
@@ -136,3 +136,16 @@ int Texture2D::load(void *data, unsigned w, unsigned h, int options) {
 	return 0;
 }
 
+int Texture2D::createRGBA(unsigned w, unsigned h) {
+	if (id)
+		glDeleteTextures(1, &id);
+	glGenTextures(1, &id);
+	glActiveTexture(GL_TEXTURE0 + 15);
+	glBindTexture(GL_TEXTURE_2D, id);
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_BASE_LEVEL, 0);
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAX_LEVEL, 0);
+	glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, w, h, 0, GL_RGBA, GL_UNSIGNED_BYTE, NULL);
+	width = w;
+	height = h;
+	return 0;
+}
diff --git a/common/core.h b/common/core.h
@@ -97,6 +97,7 @@ struct Texture2D {
 	~Texture2D() { if (id) { glDeleteTextures(1, &id); } };
 	int load(const char *fn, int options);
 	int load(void *data, unsigned w, unsigned h, int options);
+	int createRGBA(unsigned w, unsigned h);
 	void use(unsigned index) {
 		glActiveTexture(GL_TEXTURE0 + index);
 		glBindTexture(GL_TEXTURE_2D, id);