update example appliction to use the recent LightsBuffer changes

src/main.cpp

@@ -1,37 +1,39 @@
 
 #include <cassert>
+#include <cmath>
+
+#include <glm/gtc/matrix_transform.hpp>
 
 #include "tangerine.h"
 
 
 bool
-initLights(RenderState* rs)
+loadLights(RenderState* rs)
 {
-	// NOTE: add a directional light
 	LightsBuffer* lb = rs->lights_buf;
-	u32 idx = lb->active_d_lights++;
+	u32 idx = 0;
+
+#if 0
+	// NOTE: add a directional light
+	idx = (*lb->active_d_lights)++;
 	lb->dl_directions[idx] = glm::vec4(-2, 1, 3, 1);
-	lb->dl_colors[idx] = glm::vec4(1, 0.8, 0.6, 1);
+	lb->dl_colors[idx] = glm::vec4(0.5, 0.5, 0.3, 1);
 	lb->dl_intensities[idx] = glm::uvec4(1, 0, 0, 0);
+#endif
+	// NOTE: add a point light
+	idx = (*lb->active_p_lights)++;
+	lb->pl_positions[idx] = glm::vec4(-10, 0, -10, 1);
+	lb->pl_colors[idx] = glm::vec4(1, 1, 0.8, 1);
+	lb->pl_intensities[idx] = glm::vec4(3, 0, 0, 0);
 
-	// FIXME: we need an interface function to get uniforms by name
-	GLBuffer* lights_ubo = nullptr;
-	for (u32 i = 0; i < rs->gl_ctx->num_ubos; i++) {
-		GLBuffer* ubo = &rs->gl_ctx->uniform_buffers[i];
-
-		// FIXME: we need a utilty function for cstring comparison that takes
-		// 	into account the length of both strings so we don't match a longer
-		// 	string with a matching prefix
-		if (strncmp(ubo->name, "lights", 8))
-			lights_ubo = ubo;
-	}
+	GLBuffer* lights_ubo = getUBOByName(rs->gl_ctx, "lights");
+	assert(lights_ubo != nullptr);
 
 	// FIXME: we need an interface function to update lights
-	glBufferSubData(lights_ubo->target, 0, lb->buf_size, lb);
+	glBindBuffer(lights_ubo->target, lights_ubo->id);
+	glBufferSubData(lights_ubo->target, 0, lb->buf_size, lb->buffer);
 
-	// FIXME: this only makes sense for point lights
-#if 0
-	// NOTE: add a debug mesh to view the light source
+	// NOTE: add a debug mesh to view the point light source
 	RenderGroup* debug_group = getFreeRenderGroup(rs);
 	assert(debug_group);
 	ShaderProgram* s_debug = getShaderByName("debug", rs->gl_ctx);
@@ -44,14 +46,15 @@ initLights(RenderState* rs)
 					rs->rg_arena,
 					&rs->assets.models[0], // tex_cube from loadScene()
 					s_debug->num_vertex_attribs,
-					s_debug->attrib_mappings))
+					s_debug->attrib_mappings,
+					"debug_light"))
 	{
 		LOGF(Error, "Error initializing debug entity for light\n");
 		return false;
 	}
 
-	setEntityPosition(e, glm::vec3(lb->dl_directions[idx]));
-#endif
+	setEntityPosition(e, glm::vec3(lb->pl_positions[idx]));
+
 	return true;
 }
 
@@ -107,7 +110,16 @@ loadScene(RenderState* rs)
 		scaleEntity(e, 3);
 	}
 
-	return initLights(rs);
+	// NOTE: initilize the 'camera'
+	glm::vec3 cam_pos = { 0, 15, 40 };
+	glm::vec3 look_pos = { 0, 0, 0 };
+	glm::vec3 up = { 0, 1, 0 };
+	rs->xforms->view_xform = glm::lookAt(cam_pos, look_pos, up);
+	GLBuffer* xforms_ubo = getUBOByName(rs->gl_ctx, "matrices");
+	assert(xforms_ubo);
+	updateCameraTransforms(rs->xforms, xforms_ubo);
+
+	return loadLights(rs);
 }
 
 void
@@ -138,20 +150,35 @@ render_cb_pre(RenderState* rs)
 		}
 	}
 
-	// NOTE: wiggle camera
-
-	static glm::vec3 cam_pos = glm::vec3(0, 0, 50);
-	static glm::vec3 cam_mov = glm::vec3(0.3, 0, 0);
-	static glm::vec3 look_pos = glm::vec3(0, 0, 0);
-	static float direction = -1;
+	// NOTE: orbit point light
+	LightsBuffer* lb = rs->lights_buf;
+	orbitPositionZ0(&lb->pl_positions[0], 2 * M_PI / 180);
+	RenderGroup* rg = getRenderGroupByName(rs, "debug_lights");
+	Entity* ent = &rg->entities[0];
+	setEntityPosition(ent, glm::vec3(lb->pl_positions[0]));
 
-	if (cam_pos.x < -20 || cam_pos.x > 20) {
-		direction *= -1;
-		cam_mov.x *= direction;
+	// FIXME: we need an interface function to update lights
+	GLBuffer* lights_ubo = getUBOByName(rs->gl_ctx, "lights");
+	assert(lights_ubo);
+	glBindBuffer(lights_ubo->target, lights_ubo->id);
+	glBufferSubData(lights_ubo->target, 0, lb->buf_size, lb->buffer);
+
+	// NOTE: orbit camera
+	static glm::vec4 cam_pos;
+	static glm::vec3 look_pos;
+	static glm::vec3 up;
+	static bool initialized = false;
+
+	if (!initialized) {
+		cam_pos = { 0, 15, 40, 1 };
+		look_pos = { 0, 0, 0 };
+		up = { 0, 1, 0 };
+		initialized = true;
 	}
 
-	cam_pos += cam_mov;
-	rs->xforms->view_xform = glm::lookAt(cam_pos, look_pos, glm::vec3(0, 1, 0));
+	orbitPositionZ0(&cam_pos, 0.5 * M_PI / 180);
+	rs->xforms->view_xform =
+		glm::lookAt(glm::vec3(cam_pos), glm::vec3(0, 0, 0), glm::vec3(0, 1, 0));
 
 	static GLBuffer* xform_ubo = nullptr;
 
@@ -161,19 +188,17 @@ render_cb_pre(RenderState* rs)
 	}
 
 	updateCameraTransforms(rs->xforms, xform_ubo);
-#if 0
-	for (u32 i = 0; i < rs->num_render_groups; i++) {
-		RenderGroup& rg = rs->render_groups[i];
 
-		for (u32 j = 0; j < rg.num_entities; j++) {
-			Entity& e = rg.entities[j];
+	// NOTE: rotate cubes
+	RenderGroup* rg2 = getRenderGroupByName(rs, "textured_cubes");
+
+	for (u32 j = 0; j < rg2->num_entities; j++) {
+		Entity& e = rg2->entities[j];
 		float direction = (j % 2 == 0) ? 1 : -1;
 		rotateEntity(&e,
 			glm::vec3(0, 1, 0),
 			direction * (float) M_PI / (3 * 60));
 	}
-	}
-#endif
 }
 
 int