render: Add 2D projections

include/render.h

@@ -40,6 +40,7 @@ struct renderer {
 	struct {
 		GLuint program;
 		GLint u_tex;
+		GLint u_proj;
 	} shader;
 };
 

shaders/dmabuf-vertex.glsl

@@ -1,3 +1,5 @@
+uniform mat2 u_proj;
+
 attribute vec2 pos;
 attribute vec2 texture;
 
@@ -6,5 +8,5 @@ varying vec2 v_texture;
 void main()
 {
 	v_texture = vec2(texture.s, 1.0 - texture.t);
-	gl_Position = vec4(pos, 0, 1);
+	gl_Position = vec4(u_proj * pos, 0, 1);
 }

shaders/texture-vertex.glsl

@@ -1,3 +1,5 @@
+uniform mat2 u_proj;
+
 attribute vec2 pos;
 attribute vec2 texture;
 
@@ -6,5 +8,5 @@ varying vec2 v_texture;
 void main()
 {
 	v_texture = texture;
-	gl_Position = vec4(pos, 0, 1);
+	gl_Position = vec4(u_proj * pos, 0, 1);
 }

src/render.c

@@ -412,6 +412,7 @@ int renderer_init(struct renderer* self, uint32_t width, uint32_t height,
 	}
 
 	self->shader.u_tex = glGetUniformLocation(self->shader.program, "u_tex");
+	self->shader.u_proj = glGetUniformLocation(self->shader.program, "u_proj");
 
 	self->width = width;
 	self->height = height;
@@ -487,7 +488,15 @@ int render_dmabuf_frame(struct renderer* self, struct dmabuf_frame* frame)
 	glEGLImageTargetTexture2DOES(GL_TEXTURE_EXTERNAL_OES, image);
 
 	glUseProgram(self->shader.program);
+
 	glUniform1i(self->shader.u_tex, 0);
+
+	const float proj[] = {
+		1.0f, 0.0f,
+		0.0f, 1.0f,
+	};
+	glUniformMatrix2fv(self->shader.u_proj, 1, GL_FALSE, proj);
+
 	gl_render();
 
 	glBindTexture(GL_TEXTURE_2D, 0);
@@ -516,7 +525,15 @@ int render_framebuffer(struct renderer* self, const void* addr, uint32_t format,
 	glPixelStorei(GL_UNPACK_ROW_LENGTH_EXT, 0);
 
 	glUseProgram(self->shader.program);
+
 	glUniform1i(self->shader.u_tex, 0);
+
+	const float proj[] = {
+		1.0f, 0.0f,
+		0.0f, 1.0f,
+	};
+	glUniformMatrix2fv(self->shader.u_proj, 1, GL_FALSE, proj);
+
 	gl_render();
 
 	glBindTexture(GL_TEXTURE_2D, 0);