# HG changeset patch
# User Mike Pavone <pavone@retrodev.com>
# Date 1382935281 25200
# Node ID e97b80e3bd76c992623fbf346ee426aaf4bdbb20
# Parent  32f053ad9b02a3e3289fb70c1b20e772c4ffa2eb
Support interlace mode with OpenGL backend

diff -r 32f053ad9b02 -r e97b80e3bd76 default.f.glsl
--- a/default.f.glsl	Sun Oct 27 01:29:50 2013 -0700
+++ b/default.f.glsl	Sun Oct 27 21:41:21 2013 -0700
@@ -6,5 +6,9 @@
 
 void main()
 {
-	gl_FragColor = texture2D(textures[0], texcoord);
+	gl_FragColor = mix(
+		texture2D(textures[0], texcoord),
+		texture2D(textures[1], vec2(texcoord.x, texcoord.y - 1.0/512.0)),
+		sin((texcoord.y * 512.0 - 0.75) * 3.14159265359) / 2.0 + 0.5
+	);
 }
diff -r 32f053ad9b02 -r e97b80e3bd76 render_sdl.c
--- a/render_sdl.c	Sun Oct 27 01:29:50 2013 -0700
+++ b/render_sdl.c	Sun Oct 27 21:41:21 2013 -0700
@@ -160,7 +160,7 @@
 			if (i < 2) {
 				glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, 512, 256, 0, GL_BGRA, GL_UNSIGNED_BYTE, i ? context->evenbuf : context->oddbuf);
 			} else {
-				uint32_t blank = 255;
+				uint32_t blank = 255 << 24;
 				glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, 1, 1, 0, GL_BGRA, GL_UNSIGNED_BYTE, &blank);
 			}
 		}
@@ -332,8 +332,7 @@
 	glUniform1i(un_textures[0], 0);
 
 	glActiveTexture(GL_TEXTURE1);
-	//TODO: Select appropriate texture based on status of interlace
-	glBindTexture(GL_TEXTURE_2D, textures[1]);
+	glBindTexture(GL_TEXTURE_2D, (context->regs[REG_MODE_4] & BIT_INTERLACE) ? textures[1] : textures[2]);
 	glUniform1i(un_textures[1], 1);
 
 	glBindBuffer(GL_ARRAY_BUFFER, buffers[0]);
@@ -346,7 +345,10 @@
 	glDisableVertexAttribArray(at_pos);
 
 	SDL_GL_SwapBuffers();
-
+	if (context->regs[REG_MODE_4] & BIT_INTERLACE)
+	{
+		context->framebuf = context->framebuf == context->oddbuf ? context->evenbuf : context->oddbuf;
+	}
 }
 
 uint32_t blankbuf[320*240];