ReignEngine: Implement {Get,Set}InstanceDrawType

Billboards of draw type 1 are drawn with additive blending.

include/reign.h

@@ -47,6 +47,12 @@ enum RE_fog_type {
 	RE_FOG_LIGHT_SCATTERING = 2,
 };
 
+enum RE_draw_type {
+	RE_DRAW_TYPE_NORMAL   = 0,
+	RE_DRAW_TYPE_ADDITIVE = 1,
+	RE_DRAW_TYPE_MAX = RE_DRAW_TYPE_ADDITIVE
+};
+
 struct RE_options {
 	int anti_aliasing;
 	int wait_vsync;
@@ -146,6 +152,9 @@ struct RE_instance {
 	float column_radius;
 	float column_angle;  // around the Y axis, in degrees
 
+	// Billboards
+	enum RE_draw_type draw_type;
+
 	// Lights
 	vec3 vec;
 	vec3 diffuse;

src/3d/renderer.c

@@ -314,6 +314,8 @@ static void render_model(struct RE_instance *inst, struct RE_renderer *r, enum d
 		glUniform1i(r->use_shadow_map, GL_FALSE);
 	}
 
+	glBlendFuncSeparate(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA, GL_ZERO, GL_ONE);
+
 	for (int i = 0; i < model->nr_meshes; i++) {
 		struct mesh *mesh = &model->meshes[i];
 		struct material *material = &model->materials[mesh->material];
@@ -453,6 +455,14 @@ static void render_billboard(struct RE_instance *inst, struct RE_renderer *r, ma
 	glUniform1i(r->use_shadow_map, GL_FALSE);
 	glUniform1i(r->alpha_mode, ALPHA_BLEND);
 	glUniform1i(r->fog_type, inst->plugin->fog_mode ? inst->plugin->fog_type : 0);
+	switch (inst->draw_type) {
+	case RE_DRAW_TYPE_NORMAL:
+		glBlendFuncSeparate(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA, GL_ZERO, GL_ONE);
+		break;
+	case RE_DRAW_TYPE_ADDITIVE:
+		glBlendFuncSeparate(GL_SRC_ALPHA, GL_ONE, GL_ZERO, GL_ONE);
+		break;
+	}
 
 	glActiveTexture(GL_TEXTURE0);
 	glBindTexture(GL_TEXTURE_2D, bt->texture);
@@ -589,7 +599,6 @@ static void render_particle_effect(struct RE_instance *inst, struct RE_renderer
 			break;
 		}
 	}
-	glBlendFuncSeparate(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA, GL_ZERO, GL_ONE);
 	glDepthMask(GL_TRUE);
 }
 
@@ -832,7 +841,6 @@ void RE_render(struct sact_sprite *sp)
 	}
 
 	glEnable(GL_BLEND);
-	glBlendFuncSeparate(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA, GL_ZERO, GL_ONE);
 
 	setup_lights(plugin);
 

src/hll/ReignEngine.c

@@ -369,8 +369,26 @@ static bool ReignEngine_GetInstanceDrawBump(int plugin, int instance)
 	return ri->draw_bump;
 }
 
-//int ReignEngine_GetInstanceDrawType(int plugin, int instance);
-HLL_WARN_UNIMPLEMENTED(false, bool, ReignEngine, SetInstanceDrawType, int plugin, int instance, int draw_type);
+static int ReignEngine_GetInstanceDrawType(int plugin, int instance)
+{
+	struct RE_instance *ri = get_instance(plugin, instance);
+	if (!ri)
+		return 0;
+	return ri->draw_type;
+}
+
+static bool ReignEngine_SetInstanceDrawType(int plugin, int instance, int draw_type)
+{
+	struct RE_instance *ri = get_instance(plugin, instance);
+	if (!ri)
+		return false;
+	if (draw_type < 0 || draw_type > RE_DRAW_TYPE_MAX) {
+		WARNING("unknown draw type %d", draw_type);
+		return false;
+	}
+	ri->draw_type = draw_type;
+	return true;
+}
 
 bool ReignEngine_LoadInstanceMotion(int plugin, int instance, struct string *name)
 {
@@ -1771,7 +1789,7 @@ HLL_WARN_UNIMPLEMENTED(false, bool, ReignEngine, SetGlareBrightnessParam, int pl
 //float ReignEngine_GetSSAOParam(int plugin, int type);
 HLL_WARN_UNIMPLEMENTED(false, bool, ReignEngine, SetSSAOParam, int plugin, int type, float param);
 //bool ReignEngine_CalcIntersectEyeVec(int plugin, int instance, int nMouseX, int nMouseY, float *pfX, float *pfY, float *pfZ);
-HLL_WARN_UNIMPLEMENTED(false, bool, ReignEngine, IsLoading, int plugin);
+HLL_QUIET_UNIMPLEMENTED(false, bool, ReignEngine, IsLoading, int plugin);
 //int ReignEngine_GetDebugInfoMode(int plugin);
 //bool ReignEngine_SetDebugInfoMode(int plugin, int nMode);
 HLL_WARN_UNIMPLEMENTED(30, int, ReignEngine, GetVertexShaderVersion, void);
@@ -1824,7 +1842,7 @@ HLL_LIBRARY(ReignEngine,
 	    HLL_TODO_EXPORT(GetInstanceDrawBackShadow, ReignEngine_GetInstanceDrawBackShadow),
 	    HLL_EXPORT(GetInstanceDrawMakeShadow, ReignEngine_GetInstanceDrawMakeShadow),
 	    HLL_EXPORT(GetInstanceDrawBump, ReignEngine_GetInstanceDrawBump),
-	    HLL_TODO_EXPORT(GetInstanceDrawType, ReignEngine_GetInstanceDrawType),
+	    HLL_EXPORT(GetInstanceDrawType, ReignEngine_GetInstanceDrawType),
 	    HLL_EXPORT(SetInstanceDrawType, ReignEngine_SetInstanceDrawType),
 	    HLL_EXPORT(LoadInstanceMotion, ReignEngine_LoadInstanceMotion),
 	    HLL_EXPORT(GetInstanceMotionState, ReignEngine_GetInstanceMotionState),