STUFF!!!

3 files changed, 65 insertions, 39 deletions

diff --git a/src/main.cpp b/src/main.cpp
index 7242812..77b9545 100755
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -40,7 +40,8 @@ static GLuint prog;
 static GLuint main_fbo;
 static GLuint main_fbo_tex;
 
-#define VERTEX_SLOT 0
+static GLuint shadow_fbo;
+static GLuint shadow_fbo_tex;
 
 static GLuint sampler_slot;
 
@@ -49,25 +50,26 @@ Redisplay()
 {
 	// Render scene to FBO
 	glBindFramebuffer(GL_FRAMEBUFFER, main_fbo);
+	glClearColor(0.3, 0.3, 0.3, 1.0);
+	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 	glViewport(0, 0, win_width, win_height);
-	Scene::Render();
+	Scene::RenderPhong();
 
-	// Blit FBO to screen
-	glBindFramebuffer(GL_FRAMEBUFFER, 0);
-
-	glClear(GL_COLOR_BUFFER_BIT);
-
-	glUseProgram(prog);
-	glBindTexture(GL_TEXTURE_2D, main_fbo_tex);
+	glBindFramebuffer(GL_FRAMEBUFFER, shadow_fbo);
+	glClearColor(1.0, 1.0, 1.0, 1.0);
+	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+	glViewport(0, 0, win_width, win_height);
+	Scene::RenderShadow();
 
-	glUniform1i(sampler_slot, 0);
+	// Blit FBO to screen
+	glBindFramebuffer(GL_READ_FRAMEBUFFER, main_fbo);
+	glBindFramebuffer(GL_DRAW_FRAMEBUFFER, 0);
 
-	GLfloat quad[4][2] = {{-1, 1}, {-1, -1}, {1, 1}, {1, -1}};
+	glBlitFramebuffer(0, 0, win_width, win_height, 0, 0, win_width, win_height, GL_COLOR_BUFFER_BIT, GL_LINEAR);
 
-	glVertexAttribPointer(VERTEX_SLOT, 2, GL_FLOAT, GL_FALSE, 0, quad);
-	glEnableVertexAttribArray(VERTEX_SLOT);
-	glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
-	glDisableVertexAttribArray(VERTEX_SLOT);
+	glBindFramebuffer(GL_READ_FRAMEBUFFER, shadow_fbo);
+	glBindFramebuffer(GL_DRAW_FRAMEBUFFER, 0);
+	glBlitFramebuffer(0, 0, win_width, win_height, 0, 0, win_width/4, win_height/4, GL_COLOR_BUFFER_BIT, GL_LINEAR);
 
 	SDL_GL_SwapBuffers();
 }
@@ -85,11 +87,6 @@ Idle(void)
 static void
 setup_shader()
 {
-	if (!load_and_compile_program_code("blit", prog,
-					   "vertex", VERTEX_SLOT,
-					   NULL))
-		exit(-1);
-
 	sampler_slot = glGetUniformLocation(prog, "sampler");
 }
 
@@ -161,6 +158,7 @@ Reshape(int width, int height)
 	glewInit();
 
 	create_fbo(main_fbo, main_fbo_tex, width, height, true);
+	create_fbo(shadow_fbo, shadow_fbo_tex, width, height, false);
 
 	Scene::Reshape(width, height);
 }
diff --git a/src/scene.cpp b/src/scene.cpp
index 36d2ef4..5608379 100755
--- a/src/scene.cpp
+++ b/src/scene.cpp
@@ -97,7 +97,7 @@ enum {
 
 static GLUmat4 projection_matrix;
 
-static GLuint prog_phong;
+static GLuint phong_prog;
 static GLint phong_mvp_location;
 static GLint phong_mv_location;
 static GLint phong_m_location;
@@ -105,6 +105,9 @@ static GLint phong_s_location;
 static GLint phong_sampler_location;
 static GLint phong_eye_location;
 
+static GLuint shadow_prog;
+static GLint shadow_mvp_location;
+
 static GLuint cubemap;
 
 static patch_set_info *object = NULL;
@@ -114,16 +117,12 @@ Render()
 {
 	const patch_set_info *info = object;
 
-	glClearColor(0.3, 0.3, 0.3, 1.0);
-	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
-
 	const GLUvec4 ref(0.0f, 0.0f, 0.0f, 1.0f);
 	const GLUvec4 up(0.0f, 1.0f, 0.0f, 0.0f);
 	const GLUmat4 view(gluLookAt(eye, ref, up));
 
 	GLUmat4 model(gluRotate(GLUvec4(1.0, 0.0, 0.0, 0.0), 3.0 * M_PI_2));
 
-	glUseProgram(prog_phong);
 	glBindTexture(GL_TEXTURE_CUBE_MAP, cubemap);
 	glBindBuffer(GL_ARRAY_BUFFER, info->buffer_object);
 	glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, info->buffer_object);
@@ -150,12 +149,18 @@ Render()
 		const GLUmat4 mv(view * m);
 		const GLUmat4 mvp(projection_matrix * mv);
 
-		glUniform1f(phong_s_location, specular_exponent[i]);
-		glUniformMatrix4fv(phong_mvp_location, 1, false, (float *) &mvp);
-		glUniformMatrix4fv(phong_mv_location, 1, false, (float *) &mv);
-		glUniformMatrix4fv(phong_m_location, 1, false, (float *) &m);
-		glUniform1i(phong_sampler_location, 0);
-		glUniform4fv(phong_eye_location, 1, eye.values);
+		GLint current_program;
+		glGetIntegerv(GL_CURRENT_PROGRAM, &current_program);
+		if (current_program == shadow_prog) {
+			glUniformMatrix4fv(shadow_mvp_location, 1, false, (float *) &mvp);
+		} else {
+			glUniform1f(phong_s_location, specular_exponent[i]);
+			glUniformMatrix4fv(phong_mvp_location, 1, false, (float *) &mvp);
+			glUniformMatrix4fv(phong_mv_location, 1, false, (float *) &mv);
+			glUniformMatrix4fv(phong_m_location, 1, false, (float *) &m);
+			glUniform1i(phong_sampler_location, 0);
+			glUniform4fv(phong_eye_location, 1, eye.values);
+		}
 
 		glMultiDrawElements(info->mode, info->count, info->type,
 				    (const GLvoid**) info->indices,
@@ -174,6 +179,21 @@ Render()
 }
 
 
+void
+RenderPhong()
+{
+	glUseProgram(phong_prog);
+	Render();
+}
+
+void
+RenderShadow()
+{
+	glUseProgram(shadow_prog);
+	Render();
+}
+
+
 static GLUvec4
 lerp(GLUvec4 p0, GLUvec4 p1, float t)
 {
@@ -250,18 +270,25 @@ Idle()
 static void
 setup_shader()
 {
-	if (!load_and_compile_program_code("phong", prog_phong,
+	if (!load_and_compile_program_code("phong", phong_prog,
 					   "normal", 1,
 					   "tangent", 2,
 					   "uv", 3,
 					   NULL))
 		exit(-1);
-	phong_mvp_location = glGetUniformLocation(prog_phong, "mvp");
-	phong_mv_location = glGetUniformLocation(prog_phong, "mv");
-	phong_m_location = glGetUniformLocation(prog_phong, "m");
-	phong_eye_location = glGetUniformLocation(prog_phong, "eye");
-	phong_s_location = glGetUniformLocation(prog_phong, "s");
-	phong_sampler_location = glGetUniformLocation(prog_phong, "sampler");
+	phong_mvp_location = glGetUniformLocation(phong_prog, "mvp");
+	phong_mv_location = glGetUniformLocation(phong_prog, "mv");
+	phong_m_location = glGetUniformLocation(phong_prog, "m");
+	phong_eye_location = glGetUniformLocation(phong_prog, "eye");
+	phong_s_location = glGetUniformLocation(phong_prog, "s");
+	phong_sampler_location = glGetUniformLocation(phong_prog, "sampler");
+
+	if (!load_and_compile_program_code("shadow", shadow_prog,
+					   "normal", 1, // FIXME!
+					   NULL))
+		exit(-1);
+
+	shadow_mvp_location = glGetUniformLocation(shadow_prog, "mvp");
 }
 
 
diff --git a/src/scene.h b/src/scene.h
index 57d2e18..1d6e3f1 100755
--- a/src/scene.h
+++ b/src/scene.h
@@ -27,7 +27,8 @@ namespace Scene {
 void Idle();
 void Reshape(int width, int height);
 void Init();
-void Render();
+void RenderPhong();
+void RenderShadow();
 void Key(SDLKey sym, bool state);
 
 };